Use of Deuterium Labeling Studies to Determine the Stereochemical Outcome of Palladium Migrations during an Asymmetric Intermolecular Heck Reaction
摘要:
[GRAPHICS]A series of deuterium labeling experiments showed that Pd migrations during an intermolecular asymmetric Heck reaction between phenyl triflate and various deuterated 2,3-dihydrofurans (2b, 2c, 2d, 2e) occurs exclusively by either syn-1,2-dyotropic shifts or a syn-chain-walking mechanism; no evidence was observed to support anti-1,2-dyotropic shifts or anti-beta-H Pd eliminations during the formation of 6 and 7.
[EN] CHEMICAL COMPOUNDS<br/>[FR] COMPOSÉS CHIMIQUES
申请人:GLAXOSMITHKLINE LLC
公开号:WO2011017395A1
公开(公告)日:2011-02-10
The present invention relates to highly functionalized 1,3-diamino-propan-2-ols and pharmaceutically acceptable salts thereof. More specifically, the invention relates to highly functionalized 1,3-diamino-propan-2-ols that are derivatives of the HIV protease inhibitors darunavir.
Synthesis and pharmacokinetic profile of highly deuterated brecanavir analogs
作者:Emile J. Velthuisen、Todd M. Baughman、Brian A. Johns、David P. Temelkoff、Jason G. Weatherhead
DOI:10.1016/j.ejmech.2013.02.001
日期:2013.5
Several highly deuterated analogs of the HIV-1 protease inhibitor brecanavir have been prepared to study the effect of deuterium upon metabolic stability. The sites for deuterium incorporation were initially chosen to maximize the potential for a kinetic isotope effect; locations where C-H bond breaking is the rate limiting step. The analogs have been profiled in both in vitro and in vivo pharmacokinetic studies and the result will be described herein. (C) 2013 Elsevier Masson SAS. All rights reserved.
Direct observation of acyl anion equivalents by carbon-13 Fourier transform nuclear magnetic resonance
作者:Fred T. Oakes、John F. Sebastian
DOI:10.1021/jo01312a027
日期:1980.11
Substantial <sup>2</sup>H-Magnetic Isotope Effects on the Diastereoselectivity of Triplet Photocycloaddition Reactions
作者:Axel G. Griesbeck、Samir Bondock、Peter Cygon
DOI:10.1021/ja0356232
日期:2003.7.1
Magnetic isotope effects (MIE) on the diastereoselectivity of the triplet [2+2]-photocycloaddition of benzaldehyde with 2,3-dihydrofuran are described for four substrate combinations. The MIE results from H/D exchange at the reactive carbons of either the aldehyde or the alkene, respectively, but also from deuteration of the aromatic positions of benzaldehyde. Weaker isotope effects on the diastereoselectivity were detected for the reaction of alpha-deuterated propionaldehyde.