Stereocontrolled synthesis of enantiomerically pure dienyl sulfoxides via palladium-catalyzed coupling reactions
作者:Robert S. Paley、Alfonso de Dios、Roberto Fernández de la Pradilla
DOI:10.1016/s0040-4039(00)60433-1
日期:1993.4
The palladium-catalyzed coupling of enatiopure 2-halovinylsulfoxides and (E)-vinyl stannanes proceeds in an efficient, stereospecific manner to afford enantiopure 1-sulfinyldienes.
Synthesis and Diastereoselective Complexation of Enantiopure Sulfinyl Dienes: The Preparation of Sulfinyl Iron(0) Dienes
作者:Robert S. Paley、Alfonso de Dios、Lara A. Estroff、Jennifer A. Lafontaine、Carlos Montero、David J. McCulley、M. Belén Rubio、Maria Paz Ventura、Heather L. Weers、Roberto Fernández de la Pradilla、Sonia Castro、Rocío Dorado、Miguel Morente
DOI:10.1021/jo970693a
日期:1997.9.1
The preparation of a diverse array of enantiomerically pure 1- and 2-sulfinyl dienes has been achieved via Stille coupling of halovinyl sulfoxides and vinyl stannanes, hydrogenation of 1-sulfinyl-1-en-3-ynes, or vinylcupration of 1-sulfinyl alkynes. Formation of the corresponding sulfinyl diene iron(0) tricarbonyl complexes was accomplished by utilizing Fe(CO)(5)/NMO or (bda)Fe(CO)(3) as iron(0) tricarbonyl transfer reagents. Installation of the iron(0) tricarbonyl fragment was shown to be highly diastereoselective (10-16:1) for (R)-(1Z)-1-sulfinyl dienes, most likely as a result of allylic 1,3-strain. The synthesis of a 1-sulfinyl-1,3,8,10-tetraene is also described.
Enantiopure enynyl sulfoxides via palladium-catalyzed coupling reactions
作者:Robert S. Paley、Jennifer A. Lafontaine、Maria Paz Ventura
DOI:10.1016/s0040-4039(00)79195-7
日期:1993.6
Enantiomerically pure 1-sulfinyl-1-en-3-ynes are prepared from 2-halovinylsulfoxides via Sonogashira or Stille coupling procedures. The trans-enynyl sulfoxides may be hydrogenated to provide (1E, 3Z)-dienylsulfoxides.
Synthesis of Enantiopure 2-Malonylvinyl Sulfoxides via Addition-Elimination Reactions of 2-Halo- and 2-(Mesyloxy)vinyl Sulfoxides
作者:Joseph P. Marino、Edgardo Laborde、Carl F. Deering、Robert S. Paley、Maria Paz Ventura
DOI:10.1021/jo00090a042
日期:1994.6
Enantiomerically pure (E)-2-bromo- and (E)-2-iodovinyl sulfoxides 3a and 3b have been prepared in multigram quantities from (E)-1,2-bis(tri-n-butylstannyl)ethene; enantiomerically pure (E)-2-(mesyloxy) vinyl sulfoxide 3c has been synthesized by reaction of the enolate derived from condensation of 1-lithiomethyl p-tolyl sulfoxide and DMF with methanesulfonyl chloride. These compounds react with anions derived from diethyl alkylmalonates to produce enantiopure 2-malonylvinyl sulfoxides in good to excellent yields and with a high degree of stereoselectivity. The transformations proceed through an ''addition-rotation-elimination'' sequence, and the stereochemical results reinforce the concept that nucleophilic additions to vinyl sulfoxides are sterically controlled and occur predominately syn to the sulfinyl electron lone pair.