Allocolchicines via Intramolecular Nicholas Reactions: The Synthesis of NSC 51046
作者:Sinisa Djurdjevic、James R. Green
DOI:10.1021/ol7024422
日期:2007.12.1
Biaryl propargyl acetate hexacarbonyldicobalt complexes (4) undergo Lewis acid mediated Nicholas reactions with a remote arene function to afford dibenzocycloheptyne complexes (9). Reductive decomplexation based on a hydrosilylation-protodesilylation protocol is facile, and the 1,2,3,9-tetramethoxy case can be converted to NSC 51046 ((S)-N-acetylcolchicinol methyl ether, 3).