Enantioselective introduction of a benzenesulfonylmethyl substituent at an unactivated carbon atom via chemoenzymatic methods
作者:Anita R. Maguire、Leonard L. Kelleher
DOI:10.1016/s0040-4039(97)01756-5
日期:1997.10
Introduction of a benzenesulfonylmethyl group at the unactivated γ-carbon of carboxylic acid derivatives has been achieved through a combination of rhodium acetate catalysed carbenoid CH insertion and baker's yeast mediated kinetic resolution. Access to the two complementary enantiomeric series of 6 with excellent enantiocontrol is possible.
Synthesis of 2-Acetylenic Carboxylic Acids, 1-Sulfinyl and 1-Sulfonyl-2-ketones from 2-Acetylenic Phenyl Sulfides
作者:Carlos C. Fortes、Clevia F.D. Garrote
DOI:10.1080/00397919708005006
日期:1997.9
2-acetylenic phenyl sulfides into 1-methoxy-2-acetylenic phenyl sulfides. Oxidation with chromic acid gave 2-acetylenic carboxylic acids. Oxidation of 2-acetylenic phenyl sulfides with Oxone® and hydrogen peroxide in aceticacid gave the corresponding sulfoxides and sulfones respectively. Diethylamine addition to the triple bond produced enamines which were hydrolyzed with aqueous hydrochloric acid to the corresponding