Stereoselective additions of sulphoxides carbonyl compounds
摘要:
The addition of the anions of primary alkyl p-tolyl sulphoxides to aldehydes gave mixtures of all four diastereoisomeric products with low selectivity under a variety of conditions. In contrast, additions of the corresponding t-butyl derivatives afforded just two isomers, with variable stereoselectivity.
Asymmetric synthesis of chiral organosulfur compounds using N-sulfinyloxazolidinones
作者:David A. Evans、Margaret M. Faul、Lino Colombo、John J. Bisaha、Jon Clardy、David Cherry
DOI:10.1021/ja00041a011
日期:1992.7
which may be readily purified by chro- matography. These sulfinylating agents react with a wide range of nucleophiles such as Grignard reagents, enolates, lithium alkoxides, or metalated amides, with inversion of configuration at the sulfur center to afford the derived chiral sulfoxides, sulfinate esters, and sulfinamides in high yields and enantioselectivities. Competition experiments have established
Absolute Configuration, Predominant Conformations, and Vibrational Circular Dichroism Spectra of Enantiomers of <i>n</i>-Butyl <i>tert</i>-Butyl Sulfoxide
作者:Józef Drabowicz、Bogdan Dudziński、Marian Mikołajczyk、Feng Wang、Afshan Dehlavi、Joann Goring、Minni Park、Carmelo J. Rizzo、Prasad L. Polavarapu、Paolo Biscarini、Michał W. Wieczorek、Wiesław R. Majzner
DOI:10.1021/jo0011179
日期:2001.2.1
the absolute configuration (R) was ascribed. This assignment was confirmed by X-ray analysis of the complex 6 obtained from the enantiomerically pure sulfoxide (-)-1 and mercury chloride. Vibrational absorption and circular dichroism spectra of (+)-1 were measured in CDCl3 solution in the 2000-900 cm(-1) region and compared with the ab initio predictions of absorption and VCD spectra obtained with