Diels-Alder reactions of [(S)R]-(1E,3E)-1-p-tolylsulfinyl-1,3-pentadiene: the unexpected evolution of maleic anhydride adducts
作者:M. Carmen Carreño、M. Belén Cid、José L. García Ruano
DOI:10.1016/0957-4166(96)00258-3
日期:1996.7
The Diels-Alder adducts resulting in the reaction of enantiomerically pure [(S)R]-(1E,3E)-1-p-tolylsulfinyl-1,3-pentadiene with maleic anhydride evolved stereoselectively in situ through several intramolecular tandem reactions, involving [2,3]-sigmatropic sulfoxide-sulfenate rearrangement, acylation of the sulfinyl oxygen, and elimination of the sulfur function through a SN2′ process yielding lactones
Diels-Alder加合物导致对映体纯的[[S] R ]-(1 E,3 E)-1-对甲苯基亚磺酰基-1,3-戊二烯与马来酸酐的反应是通过数次分子内串联反应在原位选择性地形成的,涉及[2,3] -sigmatropic亚砜-亚磺酸酯重排,亚磺酰氧的酰化,并通过S N 2'过程消除硫功能,生成内酯3和4。
Diels-Alder reactions of [(S)R]-(1E,3E)-1-p-tolylsulfinyl-1,3-pentadiene with monosubstituted ethylenes
作者:M. Carmen Carreño、M. Belén Cid、JoséL. García Ruano、Mercedes Santos
DOI:10.1016/s0957-4166(97)00243-7
日期:1997.7
Diels-Alderreactions of [(S)R]-(1E,3E)-1-p-tolylsulfinyl-1,3-pentadiene with 1-pyrrolidinyl-1-cyclohexene and methyl acrylate evidenced: i) low reactivity of the diene regardless of the electronic character of the dienophile (high pressures were always required); ii) a complete regio- and endo-selectivity (both controlled by the sulfoxide), but a low π-facial diastereoselectivity in the cycloaddition
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 enantioselective approach to substituted triazolopyridazines from [(S)R]-1-(1E, 3E)-1-p-tolylsulfinyl-1,3-pentadiene
作者:M.Carmen Carreño、M.Belén Cid、JoséL. García Ruano、Mercedes Santos
DOI:10.1016/s0040-4039(97)10776-6
日期:1998.3
Enantiomerically pure hydroxy substituted triazolopyridazine 5a was obtained in one pot under mild conditions by reaction of (+)-(R)-(1E,3E)-1-(p-tolylsulfinyl)-1,3-pentadiene and 4-methyl-1,2,4-triazoline-3,5-dione in the presence of P(OMe)(3). The process involved a tandem Diels-Alder cycloaddition/sulfoxide-sulfenate rearrangement and trapping of the intermediate sulfenate. (C) 1998 Elsevier Science Ltd. All rights reserved.
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.