Economical Access to Diverse Enantiopure Tetrahydropyridines and Piperidines Enabled by Catalytic Borrowing Hydrogen
作者:Teng Wei Ng、Ran Tao、Willy Wei Li See、Si Bei Poh、Yu Zhao
DOI:10.1002/anie.202212528
日期:2023.1.9
An unprecedented, economical one-pot access to enantiopure N−H tetrahydropyridines is achieved by coupling a few readily available substrates with commercially available 1,3-amino alcohols via catalyticborrowinghydrogen. Highly diastereoselective functionalizations of tetrahydropyridines also result in a general access to enantiopure di- and tri-substituted piperidines, which rank among the most
BENZIMIDAZOLONE DERIVATIVES AS CB2 RECEPTOR LIGANDS
申请人:Pfizer, Inc.
公开号:EP1861377B1
公开(公告)日:2010-12-29
Structure-enantioselectivity effects in 3,4-dihydropyrimido[2,1-b]benzothiazole-based isothioureas as enantioselective acylation catalysts
作者:Dorine Belmessieri、Caroline Joannesse、Philip A. Woods、Callum MacGregor、Caroline Jones、Craig D. Campbell、Craig P. Johnston、Nicolas Duguet、Carmen Concellón、Ryan A. Bragg、Andrew D. Smith
DOI:10.1039/c0ob00515k
日期:——
The catalytic activity and enantioselectivity in the kinetic resolution of (±)-1-naphthylethanol with a range of structurally related 3,4-dihydropyrimido[2,1-b]benzothiazole-based catalysts is examined. Of the isothiourea catalysts screened, (2S,3R)-2-phenyl-3-isopropyl substitution proved optimal, giving good levels of selectivity in the kinetic resolution of a number of secondary alcohols (S values up to >100 at ∼50% conversion). Low catalyst loadings (0.10–0.25 mol%) of the optimal isothiourea can be used to generate enantiopure alcohols (>99% ee) in good yields.