Improved stereoselective synthesis of optically active methylene lactone, key intermediate for the synthesis of 1,2-oxidized furofuran lignan, by direct alpha-methylenation to butanolide
S. Yamauchi et al., Improved stereoselective synthesis of optically active methylene lactone, key intermediate for the synthesis of 1,2-oxidized furofuran lignan, by direct alpha-methylenation to butanolide, BIOS BIOT B, 64(10), 2000, pp. 2209-2215
(3R)-3-[(1R)-1-(tert-Butyldimethylsilyl)oxy-1-(2-methoxy-4,5- methylenediox
yphenyl) methyl]-2-methylene-4-butanolide, which is a key intermediate for
the synthesis of 1,2-oxidized furofuran lignan, was stereoselectively synth
esized from L-glutamic acid by applying direct methylenation to butanolide.