Unexpected conversion of vinyl sulfoxides into carbonyl compounds by means of iodotrimethylsilane
作者:Maria C Aversa、Anna Barattucci、Paola Bonaccorsi、Giuseppe Bruno、Placido Giannetto、Manuela Policicchio
DOI:10.1016/s0040-4039(00)00612-2
日期:2000.6
The unexpected and previously unknown TMSI-promoted conversion of α,β-unsaturated sulfoxides into carbonyl compounds and disulfides is described. It occurs in good yields under mild conditions. The examples provided support the generality and efficiency of this procedure which acts as a good method for removing the sulfinyl group with the advantage of transforming the vinyl sulfoxides into carbonyl
Catalytic Enantioselective Total Synthesis of (−)-Platyphyllide and Its Structural Revision
作者:Shiharu Hiraoka、Shinji Harada、Atsushi Nishida
DOI:10.1021/jo1003746
日期:2010.6.4
The catalytic asymmetric totalsynthesis of platyphyllide has been accomplished. A key highly substituted cyclohexene derivative has been obtained by the catalytic asymmetric Diels−Alder reaction of Danishefsky diene with an electron-deficient alkene. The Diels−Alder adduct was converted to a protected cyclohexane-1,3-dione in chiral form by catalytic Ito−Saegusa oxidation. Although the reported structure
An investigation of the behaviour of α,β-unsaturated sulfoxides in the presence of trimethylsilyl iodide
作者:Maria C. Aversa、Anna Barattucci、Paola Bonaccorsi、Placido Giannetto
DOI:10.1016/s0040-4020(02)01365-0
日期:2002.12
A mild, efficient and seemingly general method for converting alpha,beta-unsaturated sulfoxides into carbonyl compounds by means of trimethylsilyl iodide (TMSI) is described. Experiments on different substrates and trimethylsilyl halides lead to the conclusion that the oxidation state of the sulfur atom, on one hand, and halogen kind in TMSX on the other, assume a determining role in the progression of the reaction. The ease of experimental procedure, the possibility of H-1 NMR monitoring, and good yields of final products constitute advantages of the TMSI-promoted conversion of alpha,beta-unsaturated sulfoxides into carbonyl compounds. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetric Diels−Alder Reactions of Chiral 1-Amino-3-siloxy-1,3-butadiene: Application to the Enantioselective Synthesis of (−)-α-Elemene
作者:Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ja971272d
日期:1997.7.1
Chiral Amino Siloxy Dienes in the Diels−Alder Reaction: Applications to the Asymmetric Synthesis of 4-Substituted and 4,5-Disubstituted Cyclohexenones and the Total Synthesis of (−)-α-Elemene
作者:Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ja9921930
日期:1999.10.1
amino siloxy diene containing a C2-symmetric 2,5-diphenylpyrrolidine auxiliary was found to provide high diastereofacial control, even at or above room temperature. Upon hydrolysis of the cycloadducts, 4-substituted and 4,5-disubstituted cyclohexenones were obtained with ee's ranging from 85% to >98%. A simple model based primarily on steric arguments was developed to rationalize and predict the absolute