A catalyst don`t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. Electric Literature of 74808-09-6Electric Literature of 74808-09-6, , Name is (2R,3R,4S,5R,6R)-3,4,5-Tris(benzyloxy)-6-((benzyloxy)methyl)tetrahydro-2H-pyran-2-yl 2,2,2-trichloroacetimidate, molecular formula is C36H36Cl3NO6. In a patent, introducing its new discovery.
Through the synergistic catalytic effect of the halogen bond (XB) donor and thiourea catalyst, a direct alpha-selective N-glycosylation of the amide residue of asparagine derivative was achieved using readily accessible glycosyl trichloroacetimidate. n-Butyl methyl ether was found to be the most suitable solvent for the alpha-selectivity.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics