Asymmetric syntheses of lignans utilizing novel diastereoselective Michael addition of cyanohydrin: Syntheses of (+)-fargesin and (−)-picropodophyllone
作者:Shin-ichi Yoshida、Takeshi Yamanaka、Tutomu Miyake、Yasunori Moritani、Hiroshi Ohmizu、Tameo Iwasaki
DOI:10.1016/s0040-4020(97)00643-1
日期:1997.7
The Michael addition reaction of lithium salt of cyanohydrin to (S)- and (R)-3-(2,2-dimethyl-1,3-dioxolan-4-yl)-cis-2-propenoate (2 and 3) proceeded in 93% de in the presence of two equivalents of HMPA at -100 degrees C. This diastereoselectivity could be elucidated by the stereocontrol based on the 1,3-allylic strain. Utilizing this reaction, stereocontrolled syntheses of (+)-fargesin (6) and (-)-picropodophyllone (7) were achieved. (C) 1997 Elsevier Science Ltd.