Nazarov reaction of trisubstituted dienones: mechanism involving Wagner-Meerwein shift
摘要:
The Nazarov reactions of trisubstituted alpha,alpha'-dienones were studied. Whereas alpha,beta-dimethyl-beta'-alkyl alpha,alpha'-dienones gave 2,3-dimethyl-4-alkyl-2-cyclopentenones when heated in concentrated sulfuric acid, the reaction of beta,beta-dimethyl-beta'-alkyl alpha,alpha'-dienones afforded 3,4-dimethyl-4-alkyl-2-cyclopentenones as the rearranged products. A mechanistic investigation using two deuterated dienones suggests that the Nazarov reactions of the latter dienones are accompanied by Wagner-Meerwein shifts to form the most stable carbocations.
METHODS OF DESIGNING, PREPARING, AND USING NOVEL PROTONOPHORES
申请人:Martineau Louis C.
公开号:US20140135359A1
公开(公告)日:2014-05-15
The present invention provides a computer-assisted method of generating a protonophore requiring the use of a computer including a processor. The method includes: designing the protonophore, calculating, using the processor, an estimated protonophoric activity; producing the protonophore if the estimated protonophoric activity corresponds to an U
50
of about 20 μM or less; and determining the uncoupling activity of the protonophore. The present invention also provides novel protonophores that meet the above requirement and their methods of use.
Synthesis of Silyloxy Dienes by Silylene Transfer to Divinyl Ketones: Application to the Asymmetric Synthesis of Substituted Cyclohexanes
作者:Christian C. Ventocilla、K. A. Woerpel
DOI:10.1021/jo202650k
日期:2012.4.6
to divinyl ketones provided 2-silyloxy-1,3-dienes with control of stereochemistry and regioselectivity. The products participated in Diels–Alder reactions with electron-deficient alkenes and imines to form six-membered-ring products diastereoselectively. Cycloaddition reactions with alkenes bearing chiralauxiliaries provided access to chiral, nonracemic cyclohexenes. The methodology, therefore, represents