by the regio- and stereoselective ring opening of β, γ, and δ-lactones with unsaturated substituents at the ω-position using organocopperreagents such as halomagnesium diorganocuprates or Grignard reagents in the presence of copper(I) iodide. Both the organocopperreagents with primary, secondary, tertiary alkyl, and phenyl groups gave the corresponding carbon homologated alkenoic acids in good yields
TRANSFORMATION OF β-ALKENYL-β-PROPIOLACTONES INTO CYCLOPROPYLACETIC ACIDS UTILIZING HYDROBORATION
作者:Masatoshi Kawashima、Tamotsu Fujisawa
DOI:10.1246/cl.1983.1273
日期:1983.8.5
The reaction of β-alkenyl-β-propiolactones with 9-borabicyclo[3.3.1]nonane and subsequent treatment with sodium methoxide gave cyclopropylacetic acids in good yields.
THE HIGHLY SELECTIVE REACTION OF LITHIUM DITHIOESTER ENOLATES WITH β-ALKENYL-β-PROPIOLACTONES: A SIMPLE METHOD FOR THE SYNTHESIS OF 6-(METHYLTHIO)THIOCARBONYL-(<i>E</i>)-3-ALKENOIC ACIDS
作者:Tamotsu Fujisawa、Toshiyuki Itoh、Toshio Sato
DOI:10.1246/cl.1983.1901
日期:1983.12.5
Lithium dithioester enolates were found to react with β-alkenyl-β-propiolactones highly regio- and stereoselectively at the terminal vinyl carbon to give 6-(methylthio)thiocarbonyl-(E)-3-alkenoic acids, masked 1,7-dicarboxylic compounds.