作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
The Inner-Sphere Process in the Enantioselective Tsuji Allylation Reaction with (<i>S</i>)-<i>t</i>-Bu-phosphinooxazoline Ligands
作者:John A. Keith、Douglas C. Behenna、Justin T. Mohr、Sandy Ma、Smaranda C. Marinescu、Jonas Oxgaard、Brian M. Stoltz、William A. Goddard
DOI:10.1021/ja070516j
日期:2007.10.1
We propose an inner-sphere mechanism explaining the unique performance of the Tsuji asymmetrical allylation reaction using hard prochiral enolate nucleophiles and non-prochiral allyl groups. Using first principles quantum mechanics (B3LYP density functional theory), we find that the pathway for this reaction involves nucleophilic attack followed by interconversion from a five-coordinate Pd complex
One step catalytic conversion of cellulose to sustainable chemicals utilizing cooperative ionic liquid pairs
作者:Jinxing Long、Bin Guo、Xuehui Li、Yanbin Jiang、Furong Wang、Shik Chi Tsang、Lefu Wang、Kai Man K. Yu
DOI:10.1039/c1gc15597k
日期:——
A 100% conversion of cellulose to industrially useful chemicals is, for the first time, achieved in a single pot reaction by the use of cooperative ionicliquid pairs for combined dissolution and catalytic degradation of cellulose, which overcomes the long intrinsic phase problem in the conversion of biomass to chemicals.
作者:Raquel M. Cravero、Manuel González-Sierra、Guillermo R. Labadie
DOI:10.1002/hlca.200390223
日期:2003.8
Different convergentapproaches to the highly oxygenated sesquiterpene natural product saudin (1), has been investigated. Our strategy has included a Michael addition and aldol condensation reaction as key steps. During the synthetic development, we have found serious steric hindrance when an α-Me-substituted alkyl vinyl ketone was used. Such steric hindrance has been overcome by synthesizing the vinyl
Methods of treating hypertension and pharmaceutical compositions
申请人:E. I. Du Pont de Nemours and Company
公开号:US04001425A1
公开(公告)日:1977-01-04
This invention relates to methods of treating hypertension and pharmaceutical compositions comprising a class of 1-tertiary-alkyl-3-(substituted furyl)ureas that exhibit antihypertensive activity in warm-blooded animals. A representative compound is 1-tert-butyl-3-(2,5-dihydro-5-oxo-3-furyl)urea.