Jh. Rigby et Wt. Dong, [4+1] cycloaddition of bis(alkylthio)carbenes with vinyl isocyanates. Total synthesis of (+/-)-mesembrine, ORG LETT, 2(12), 2000, pp. 1673-1675
[GRAPHICS]
The Sceletium alkaloid mesembrine has been synthesized in 13% overall yield
by a sequence featuring a [4 + 1] cycloaddition of a bis-(alkylthio)carben
e with a functionalized vinyl isocyanate.