C-benzylation of various sodium enolates derived frommethyl malonate, beta-ketoesters, a beta-cyanoester, a beta-cyanosulfone, ketones and a carboxylic ester is reported. Reaction of alkoxydiphenylsulfonium salts formed by treating various benzyl alcohols with diphenyl sulfide bis(trifluoromethanesulfonate) (derived from trifluoromethanesulfonic anhydride and diphenyl sulfoxide) proceeded smoothly, and
A bidirectional synthesis of spiroacetals via Rh(<scp>ii</scp>)-catalysed C–H insertion
作者:Romain J. Lepage、Jonathan M. White、Mark J. Coster
DOI:10.1039/c7cc00459a
日期:——
Acyclic methylene acetals bearing two diazoester subunits have been converted to [5,5]-spiroacetalsviabidirectional C–H insertion under Rh(ii) catalysis.
Stereoselective bidirectional synthesis of spiroacetals via Rh(II)-catalysed double C–H insertion
作者:Romain J. Lepage、Mark J. Coster
DOI:10.1016/j.tet.2018.01.043
日期:2018.3
Rh(II)-catalysed double C–H insertion of methylene acetals bearing two diazo ester substituents is described. The diastereoselectivity of this bidirectional approach can be tuned through appropriate choice of catalyst, and chiral catalysts lead to products with up to 89% ee. The diastereoselectivity of the first cyclisation suggests that the second cyclisation proceeds via a non-concerted pathway.
Stereocontrolled functionalization in the cyclohexane ring using organomolybdenum chemistry
作者:Anthony J. Pearson、M. Nazrul I. Khan、Jon C. Clardy、Cun Heng He
DOI:10.1021/ja00295a030
日期:1985.5
La reaction entre les cations (η 4 -cyclohexadiene) Mo(CO) 2 Cp ou (η 4 -methyl-5 cyclohexadiene) Mo(CO) 2 Cp et une serie de nucleophiles enolates stables a ete etudiee. Elle se produit avec une forte regio- et stereoselectivite conduisant a des complexes: (π-allyl) Mo(CO) 2 Cp
La 反应 entre les cations (η 4 -cyclohexadiene) Mo(CO) 2 Cp ou (η 4 -methyl-5 cyclohexadiene) Mo(CO) 2 Cp et une serie de nucleophiles enolates stables a etudiee。Elle se produit avec une forte regio-etstereoselectivite conduisant a des complexes: (π-allyl) Mo(CO) 2 Cp
Regio- and stereocontrolled functionalization of cycloheptadiene using organoiron and organoselenium chemistry
作者:Anthony J. Pearson、Sandra L. Kole、Tapan Ray
DOI:10.1021/ja00332a050
日期:1984.10
Etude des complexes cycloheptadienyl-fer carbonyles: reactivite, conformation, enlevement du metal et cyclofonctionalisation desdienes obtenus
Etude des complexes cycloheptadienyl-fer carbonyles:reactivite,conformation,enlevement du metal et cyclofonctionalisation des diene obtenus