Enantiospecific synthesis of optically pure (3s)-hydroxy esters by the stereocontrolled yeast reduction of α-sulfenyl-β-ketoesters
作者:Tamotsu Fujisawa、Toshiyuki Itoh、Toshio Sato
DOI:10.1016/s0040-4039(01)91125-6
日期:——
Stereocontrol in Baker's yeast reduction of β-ketoesters was successfully achieved by introducing the sulfenyl group at α-position of the esters to afford opticallypure (S)-β-hydroxy esters.
4-Sulfenyl-2-carbamoyl-4-isoxazolin-3-ones (4) were designed on the basis of biological isosterism and prepared in four steps. Some of these compounds showed sufficient pre-emergent herbicidal activities against various kinds of weeds. Among the synthesized compounds, 2-(N-(4-chlorophenyl)-N-isopropylcarbamoyl)-4-ethyl-thio-5-methyl-4-isoxazolin-3-one (4cd) exhibited the most promising activity.