A novel synthesis of the cyclic carbinolamide moiety of the maytansinoids
作者:Konstantinos S. Petrakis、Josef Fried
DOI:10.1016/s0040-4039(00)88096-x
日期:1983.1
The α-diketo urethane 3 cyclizes to form the cyclic carbinolamide 4 using TMS triflate and 2,6-di-t-butylpyridine. The siloxy group of 4 is readily exchanged in methanol or water to form 6 or 7. Remarkably, 3 does not cyclize spontaneously or on standard acid catalysis.