Direct Preparation of Guanidine from Trichloroacetamide. A Potentially Important Method to (−)-Tetrodotoxin
作者:Noboru Yamamoto、Minoru Isobe
DOI:10.1246/cl.1994.2299
日期:1994.12
Trichloroacetamides obtained via Overman [3,3] sigmatropic rearrangement were converted into dibenzyl guanidines. The key step was conversion of carbodiimide intermediate into guanidine by scandium or ytterbium trifluoromethane-sulfonates. This method was applied to a synthesis of guanidinium ring of (−)-tetrodotoxin.