First Diels-Alder Reactions of Enantiomerically Pure 1-p-Tolylsulfinyl Dienes: Straightforward Access to Cyclohexenols through Tandem Cycloaddition/[2,3]-Sigmatropic Rearrangement
摘要:
The asymmetric Diels-Alder reactions of (R)-1-(p-tolylsulfinyl)-1,3-butadienes 3a-c with N-methylmaleimide (NMM) have been explored. The cycloadditions are stereospecific: only one endo adduct is formed, the pi-facial diastereoselectivity being controlled by the sulfoxide both in thermal and catalytic conditions. The in situ cycloaddition/sulfoxide sulfenate [2,3]-sigmatropic rearrange ment starting from chiral 3a-e in the presence of an excess of NMM, which acts as thiophilic agent, provides a convenient one-step access to enantiomerically pure and all-cis functionalized cyclohexenols (-)-5a-c.
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.
Stereoselective Synthesis of Racemic and Optically Active <i>E</i>-Vinyl and <i>E</i>-Dienyl Sulfoxides via Wittig Reaction of α-Sulfinyl Phosphonium Ylides
A series of ol-sulfinyl phosphonium ylides have been obtained in the reaction of phosphonium mono- and diylides with sulfinic acid esters. The use of(-)-(S)-menthyl-p-toluenesulfinate in this reaction afforded the corresponding (S)-((p-tolylsulfinyl)methyl)triphenylphosphonium ylide. The Wittig reaction of these ylides with saturated and unsaturated aldehydes resulted in the formation of racemic and optically active (+)-(R)-vinyl and dienyl sulfoxides with the E-geometry. The synthesis of (+)-(R)-((p-tolylsulfinyl)methyl)triphenyl iodide as a precursor of the optically active ylide has also been described.
Short and Efficient Synthesis of Enantiomerically Pure 4-Substituted (1<i>E</i>,3<i>E</i>)-1[(<i>R</i>)-<i>p</i>-Tolylsulfinyl]-1,3-butadienes
作者:Guy Solladié、Pilar Ruiz、Françoise Colobert、M. Carmen Carreño、José L. Garcia-Ruano
DOI:10.1055/s-1991-26633
日期:——
The title compounds were readily prepared in two steps by the condensation of (+)-methyl p-tolyl (R)-sulfoxide to α,β-unsaturated aldehydes followed by a one-pot dehydration of the resulting β-hydroxy sulfoxides.
First Diels-Alder Reactions of Enantiomerically Pure 1-p-Tolylsulfinyl Dienes: Straightforward Access to Cyclohexenols through Tandem Cycloaddition/[2,3]-Sigmatropic Rearrangement
作者:Eva Arce、M. Carmen Carreno、M. Belen Cid、Jose L. Garcia Ruano
DOI:10.1021/jo00091a035
日期:1994.6
The asymmetric Diels-Alder reactions of (R)-1-(p-tolylsulfinyl)-1,3-butadienes 3a-c with N-methylmaleimide (NMM) have been explored. The cycloadditions are stereospecific: only one endo adduct is formed, the pi-facial diastereoselectivity being controlled by the sulfoxide both in thermal and catalytic conditions. The in situ cycloaddition/sulfoxide sulfenate [2,3]-sigmatropic rearrange ment starting from chiral 3a-e in the presence of an excess of NMM, which acts as thiophilic agent, provides a convenient one-step access to enantiomerically pure and all-cis functionalized cyclohexenols (-)-5a-c.