Silylative Kinetic Resolution of Racemic 1-Indanol Derivatives Catalyzed by Chiral Guanidine
作者:Shuhei Yoshimatsu、Akira Yamada、Kenya Nakata
DOI:10.1021/acs.joc.7b02493
日期:2018.1.5
Efficient kinetic resolution of racemic 1-indanol derivatives was achieved using triphenylchlorosilane by asymmetric silylation in the presence of chiral guanidine catalysts. The chiral guanidine catalyst (R,R)-N-(1-(β-naphthyl)ethyl)benzoguanidine was found to be highly efficient as only 0.5 mol % catalyst loading was sufficient to catalyze the reaction of various substrates with appropriate conversion
Disclosed herein is a compound having a structure
compositions, methods, and medicaments related thereto are also disclosed.
本文披露了一种具有结构的化合物,同时还披露了相关的组成、方法和药物。
Therapeutic fluoroethylcyano guanidines
申请人:Allergan, Inc.
公开号:US07884244B2
公开(公告)日:2011-02-08
Disclosed herein is compound having a formula
as described herein. Therapeutic methods, compositions, and medicaments related thereto are also disclosed.
本文披露了一种具有如下公式的化合物。同时还披露了与之相关的治疗方法、组合物和药物。
Stereochemical Sensitivity of the Human UDP-glucuronosyltransferases 2B7 and 2B17
A set of 28 enantiomers comprising rigid and flexible secondary alcohols was synthesized by the asymmetric Corey-Bakshi-Shibata reduction. The enantiomerically pure alcohols were subjected to enzymatic glucuronidation assays employing the human UDP-glucuronosyltransferases (UGTs) 2B7 and 2BI7. Both UGTs displayed high levels of stereo selectivity, favoring the conjugation of the (R)-enantiomers over their respective (S)-stereoisomers at eudismic ratios up to 256. The spatial arrangement of the hydroxy group determined the diastereoselectivity of the UGT2B17-catalyzed reaction in agreement with Pfeiffer's rule (eudismic activity quotient = 0.83 +/- 0.14). Inhibition studies revealed that the enantiomers had similar affinities toward the enzymes. The diastereoselectivity of the UGT-catalyzed conjugation stemmed, therefore, from the arrangement of the substrates in the catalytic site, rather than from distinct affinities toward the enzymes. Taken together, this study showed that metabolic enzymes that are generally conceived to be rather "flexible" in nature are capable of displaying high levels of chiral distinction.