Some tips on 29943-42-8

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29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Tetrahydropyran-4-one (7.5 g, 75 mmol, 1 equiv.) in MeOH (75 mL) was cooled to 0 C. NaBH4 (1.425 g, 37.5 mmol, 0.5 equiv.) was added in portions at 0 C. The mixture was heated to RT and stirred for 1 h at RT. MeOH was distilled off and the mixture was diluted with iced water, neutralised with acetic acid, and extracted with EA (3¡Á30 mL). The organic phase was concentrated under reduced pressure and the product was obtained as a colourless oil (4.3 g, 56% yield).

29943-42-8, As the paragraph descriping shows that 29943-42-8 is playing an increasingly important role.

Reference£º
Patent; Gruenenthal GmbH; US2012/46301; (2012); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Downstream synthetic route of 29943-42-8

As the paragraph descriping shows that 29943-42-8 is playing an increasingly important role.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To the stirred solution of tetrahydro-4H-pyran-4-one (2 g, 9.33 mmol), tert-butoxycarbonyl hydrazide (1.8 g, 13.99 mmol) in AcOH: MeOH (1 :1 , 10 mL), NaCNBH3 (0.52 g, 8.4 mmol) was added portion wise at 0 C and the reaction mixture was stirred at RT for 30 min. Completion of the reaction was monitored by TLC; the reaction mixture was then concentrated under vacuum. The resulting mixture was suspended with 10% NaHC03 (20 mL) and was extracted with DCM (2 x 15 ml_). The combined organic layer was washed with brine (10 mL), dried over anhydrous Na2S04 and concentrated under vacuum to afford the title compound. Yield: 99% (crude) (2 g, off white solid). 1H NMR (400 MHz, DMSO-d6): delta 8.20 (s, 1 H), 4.34 (s, 1 H), 3.82-3.81 (m, 2H), 3.29-3.26 (m, 2H), 2.89-2.88 (m, 1 H), 1.63 (t, J = 2.0 Hz, 2H), 1.38 (s, 9H), 1.24 (t, J = 4.0 Hz, 2H). LCMS: (Method A) 1 17.2 (M-Boc), Rt. 1.2 min, 99.7%., 29943-42-8

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Reference£º
Patent; ASCENEURON S.A.; QUATTROPANI, Anna; KULKARNI, Santosh S.; GIRI, Awadut Gajendra; (179 pag.)WO2019/37861; (2019); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Downstream synthetic route of 29943-42-8

As the paragraph descriping shows that 29943-42-8 is playing an increasingly important role.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Intermediate 221,1-Dimethylethyl 2-(tetrah dro-2H-pyran-4-yl)hydrazinecarboxylateTetrahydro-4H-pyran-4-one (9.69 g, 97 mmol) was added to a solution of 1,1- dimethylethyl hydrazinecarboxylate (14.07 g, 106 mmol) in methanol (100 mL) and stirred at room temperature for 3 h. The solvent was removed in vacuo, and the crude residue was suspended in acetic acid (140 mL). Next added sodium cyanoborohydride (6.69 g, 106 mmol) in portions over 3 minutes. The contents were stirred at room temperature for 60 h. The solvent was removed in vacuo, and the crude residue was suspended in DCM (100 mL). The reaction mixture was adjusted to pH 7 with 6N NaOH. The layers were separated, and the aq. layer extracted with DCM. The combined organic layers were washed with saturated NaHC03, and brine. The organic layer was dried over MgS04, filtered, and concentrated in vacuo to afford the product as a solid, 18.4 g (88%). 1H NMR (400 MHz, DMSO-d6) delta ppm 1.22 (m, 2 H), 1.39 (s, 9 H), 1.43 – 1.48 (m, 1 H), 1.59 – 1.69 (m, 2 H), 2.82 – 2.98 (m, 1 H), 3.20 – 3.32 (m, 2 H), 3.80 (d, J=l 1.62 Hz, 2 H), 4.36 (br. s., 1 H), 8.07 – 8.34 (m, 1 H)., 29943-42-8

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Reference£º
Patent; GLAX0SMITHKLINE LLC; BURGESS, Joelle, Lorraine; JOHNSON, Neil, W.; KNIGHT, Steven, David; LAFRANCE, Louis, Vincent, III; MILLER, William, H.; NEWLANDER, Kenneth, Allen; ROMERIL, Stuart, Paul; ROUSE, Meagan, B.; SUAREZ, Dominic; TIAN, Xinrong; VERMA, Sharad, Kumar; WO2013/39988; (2013); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

New learning discoveries about 29943-42-8

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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.29943-42-8,Dihydro-2H-pyran-4(3H)-one,as a common compound, the synthetic route is as follows.

(u) 2-(m,p-dimethoxyphenyl)-ethyl, m.p. 188-191; The amine starting material for compound (e), 2-(tetrahydropyran-4-yl)-ethylamine, can be prepared from tetrahydropyran-4-one e.g. by Wittig condensation with diethyl cyanomethyl phosphonate followed by hydrogenation and reduction with lithium aluminum hydride., 29943-42-8

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Reference£º
Patent; Ciba-Geigy Corporation; US4977144; (1990); A;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

New learning discoveries about 29943-42-8

29943-42-8, The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To 75 g (0.75 mol) of tetrahydropyran-4-one in THF (150 mL) is added a suspension of 28.4 g (0.75 mol) LiAlH4 in THF (600 mL) under nitrogen atmosphere maintaining the temperature below 30 C. with the aid of an ice-bath. Then the reaction is allowed to warm to RT and stirred for 5 h. The reaction is quenched by addition of sat. aq. NH4Cl solution until effervescence ceased. The resulting precipitate is removed by filtration through Celite and washed with THF (150 mL). The filtrate is concentrated under reduced pressure to afford 71.1 g of tetrahydropyran-4-ol. Yield: 92%.

29943-42-8, The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Boehringer Ingelheim International GmbH; Riether, Doris; Binder, Florian Paul Christian; Doods, Henri; Mueller, Stephan Georg; Nicholson, Janet Rachel; Sauer, Achim; US8865744; (2014); B1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Simple exploration of 29943-42-8

The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a room temperature mixture of NaH (60% in hexane, 10.0 g, 250 mmol) in THF (300 mL) were added tetrahydropyran-4-one 1 (10.0 g, 100 mmol) and dimethylcarbonate (21 mL, 250 mmol). Then the mixture was heated to 45C overnight. The final mixture was poured into 0.0 IN HC1 and Et20, filtered over celite, the separated organic layer was dried over anhydrous sodium sulfate and the residue was purified over silica gel (petroleum ether/ethyl acetate =50: 1) to give the desired product 2 (7.8 g, 49% yield). 1H-NMR (300 MHz, CDCls) delta: 4.23 (m, 1H), 3.84 (t, 2H), 3.77 (m, 2H), 3.75 (s, 3H), 2.39 (m, 2H)., 29943-42-8

The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; ZHOU, Han-Jie; PARLATI, Francesco; WUSTROW, David; WO2014/15291; (2014); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Some tips on 29943-42-8

29943-42-8, As the paragraph descriping shows that 29943-42-8 is playing an increasingly important role.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a stirred solution of tetrahydro-4H-pyran-4-one (1 g, 10 mmol) in THF (10 mL) was added methylamine (0.62 g, 20 mmol, 2 M solution in THF) dropwise at ambient temperature followed by acetic acid (0.5 mL). The reaction mixture was stirred for 1 h. Sodium cyanoborohydride (0.7 g, 12 mmol) was added to the reaction mixture at 0 C. and continued stirring at ambient temperature for 16 h. Completion of the reaction was confirmed by TLC. The product was isolated to afford N-methyltetrahydro-2H-pyran-4-amine (1 g) as a yellow colorliquid.GCMS (ESI) m/z 115 [M]+.

29943-42-8, As the paragraph descriping shows that 29943-42-8 is playing an increasingly important role.

Reference£º
Patent; Celgene Corporation; CANAN, Stacie S.; HAWRYLUK, Natalie Anne; WITTY, Michael John; (74 pag.)US2017/348315; (2017); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Simple exploration of 29943-42-8

29943-42-8, The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a mixture of NaH(1.97 g, 44.96 mmol) in THF(100 ml) was added dropwise dihydro-2H-pyran-4(3H)-one(3 g, 29.96 mmol) in an ice bath. After stirring for 20 mi dimethyl carbonate(3.8 ml, 44.96 mmol) was added. The reaction mixture was stilTed at ft for 3 h. To a mixture of diethyl ether / iN HC1 was poured reaction mixture with stirring. The organic layer was separated, dried over Na2SO4, concentrated under reduced pressure and the residue was purified by column chromatography to afford the desired product 1-1(1.5 g) as a yellow liquid.1H NMR (300 MHz, CDC13) 5 11.752 (s, 1H), 4.267 (m, 2H), 3.863 (m, 2H), 3.783 (m, 2H), 3.758 (s, 3H), 2.393 (m, 2H), 1.85 1 (m, 2H).

29943-42-8, The synthetic route of 29943-42-8 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; ST PHARM CO., LTD.; KIM, Kyungjin; KIM, Uk-Il; YOON, Ji Hye; (32 pag.)WO2017/99424; (2017); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Simple exploration of 29943-42-8

29943-42-8 Dihydro-2H-pyran-4(3H)-one 121599, aTetrahydropyrans compound, is more and more widely used in various.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Step A: Preparation of 4-methylenetetrahydro-2H-pyran: A solution of dihydro-2H-pyran-4(3H)-one (2.50g; 25.0mmol) in THF (50mL) was sparged with nitrogen for 15 minutes. The solution was cooled to 5 C under nitrogen with stirring. A solution of Tebbe reagent (bis(cyclopentadienyl)-mu-chloro(dimethylaluminum)-mu-methylenetitanium) (25.0 mmol; 0.50 M solution in toluene; Sigma- Aldrich Chemical Co.) was added. The mixture was allowed to warm to ambient temperature. Ether was added (400 mL). The reagent was quenched by the careful addition of 0.1M sodium hydroxide (10 mL). (The quench is highly exothermic with considerable effervescence). The resulting solution was dried (sodium sulfate) and filtered through a mixture of Celite and alumina washing the filter cake with ether. The filtrate was partially concentrated to remove the majority of the ether at 50 C and a pressure of 580 mm Hg. The resulting mixture was diluted with pentane, filtered through Celite and then partially concentrated as previously (taking care not to lose the volatile product). The resulting solution in toluene/pentane was continued to the next step without characterization of the product.

29943-42-8 Dihydro-2H-pyran-4(3H)-one 121599, aTetrahydropyrans compound, is more and more widely used in various.

Reference£º
Patent; ARRAY BIOPHARMA INC.; BOYS, Mark Laurence; BURGESS, Laurence, E.; GRONEBERG, Robert, D.; HARVEY, Darren, M.; HUANG, Lily; KERCHER, Timothy; KRASER, Christopher, F.; LAIRD, Ellen; TARLTON, Eugene; ZHAO, Qian; WO2011/130146; (2011); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

Downstream synthetic route of 29943-42-8

29943-42-8 Dihydro-2H-pyran-4(3H)-one 121599, aTetrahydropyrans compound, is more and more widely used in various.

29943-42-8, Dihydro-2H-pyran-4(3H)-one is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a solution of tetrahydro-pyran-4-one (1.3 kg, 12.98 mol) and carbonic acid dimethyl ester (11.69 kg, 129.8 mol) was added solid potassium ferf-butoxide (1.89 kg, 16.08 mol) in portions at -10C over 2 h under nitrogen protection. The suspension was stirred at room temperature 10 h after the addition. LCMS (215nm) indicated that tetrahydro-pyran-4-one had been completely consumed. The reaction was acidified by HCl (2 N) to pH 6~7 and then the phases were separated. The organic phase was washed with water (3 Lx2) and the combined aqueous phases were extracted with MTBE (2.5 Lx2). The combined organic phase was concentrated under reduced pressure at 25C to remove most of MTBE. The residue was distilled out by oil pump (~200 Pa) at 74 C to give the title compound as colorless oil (545 g, 26.3%). CHN analysis: calculated (results). C 53.16 (53.10), H 6.37 (6.245), N 0.00 (0.00).

29943-42-8 Dihydro-2H-pyran-4(3H)-one 121599, aTetrahydropyrans compound, is more and more widely used in various.

Reference£º
Patent; NOVARTIS AG; CHEUNG, Atwood, Kim; CHIN, Donoval, Noel; FAN, Jianmei; SHULTZ, Michael, David; TOMLINSON, Ronald, Charles; WO2013/10092; (2013); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics