Stereoselective total synthesis of (.+-.)-gymnomitrol via reduction-alkylation of .alpha.-cyano ketones
作者:Robert M. Coates、Shrenik K. Shah、Robert W. Mason
DOI:10.1021/ja00372a016
日期:1982.4
Synthesis of (±)-Gymnomitrol. Mn(OAc)<sub>3</sub>-Initiated Free-Radical Cyclization of Alkynyl Ketones
作者:Steven V. O'Neil、Cheri A. Quickley、Barry B. Snider
DOI:10.1021/jo9622338
日期:1997.4.1
Mn(OAc)(3)-initiated cyclization of alkynyl ketones in 9-19:1 EtOH/HOAc at 90 degrees C is a useful cyclization procedure in favorable cases. Cyclization of (trimethylsilyl)alkynyl ketone 4e provides 62% of silylalkenes 26 and 27 in the key reaction of a seven-step (16% overall yield) synthesis of gymnomitrol (1) from readily available ketone 23. 9alpha-Hydroxygymnomitryl acetate (2) and 9-oxogymnomitryl