Reaction of 2,3-epoxy-1-ol methanesulfonates with diethylaluminum chloride or with the mixture of diethylaluminum chloride and diethylamine hydrobromide in dichloromethane gave rise to regioselectively the corresponding 3-chloro- and 3-bromo-1,2-diol 1-methanesulfonates, respectively, in excellent yields.
Total synthesis of (−)-dactylyne and (−)-isodactylyne
作者:Lian-xun Gao、Akio Murai
DOI:10.1016/s0040-4039(00)74257-2
日期:1992.7
The first total synthesis of (-)-dactylyne (1) and (-)-isodactylyne (2), which are isolated from sea hare, is described via intermediates 3-15 and 17-18. Critical steps in the synthesis include a stereoselective construction as well as an intramolecular ring closure of 12, and the effective double elongation reactions (15 --> 17 and 17 --> 18).