Total synthesis of colchicine modelled on a biogenetic theory
作者:A.I. Scott、F. McCapra、R.L. Buchanan、A.C. Day、D.W. Young
DOI:10.1016/s0040-4020(01)96977-7
日期:1965.1
A five step synthesis of desacetamidocolchiceine (XLVI) is described in which rings A and C are joined by oxidative coupling of the tropolone system. This completes a biogenetic-type total synthesis of colchicine (I).
An efficient route based upon solvolytic fragmentation of a cyclopentadiene-dichloroketene adduct 4c has been investigated for the synthesis of trimethoxyphenylpropyltropolone 2b, a synthetic intermediate of colchicine 1a. Attempted synthesis of the corresponding unsaturated tropolones 8a and 10 is also discussed.