A synthesis of the spiroacetal moiety of milbemycin β<sub>3</sub>
作者:Philip Kocienski、Stephen D. A. Street
DOI:10.1039/c39840000571
日期:——
Intramolecular reaction of an enol silylether with a dioxonium ion generated by treatment of the 1,5,7-trioxaspiro[5.5]undecane (5b) with BF3·Et2O was the key step in a synthesis of the 1,7-dioxaspiro[5.5]undecane moiety (2) of Milbemycin β3(1).