The alkaloid (±)-colchicine (1) was synthesized by a methylene transfer reaction from the spirodienone (3b), followed by acid catalysed rearrangement and dehydrogenation to give deacetamido-isocolchicine (7).
A fully regiocontrolled synthesis of desacetamidoisocolchicine: formal total synthesis of colchicine
作者:Martin G. Banwell、John N. Lambert、Jacqueline M. Gulbis、Maureen F. Mackay
DOI:10.1039/c39900001450
日期:——
steps from the known cyclohexenone 6, reacts with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) to give desacetamidoisocolchicine 2 in 84% yield; the acquisition of 2 constitutes a formal totalsynthesis of the alkaloid colchicine 1.
Banwell, Martin G.; Lambert, John N.; Corbett, Madeline, Journal of the Chemical Society. Perkin transactions I, 1992, # 11, p. 1415 - 1426
作者:Banwell, Martin G.、Lambert, John N.、Corbett, Madeline、Greenwood, Richard J.、Gulbis, Jacqueline M.、Mackay, Maureen F.
DOI:——
日期:——
BANWELL, MARTIN G.;LAMBERT, JOHN N.;GULBIS, JACQUELINE M.;MACKAY, MAUREEN+, J. CHEM. SOC. CHEM. COMMUN.,(1990) N0, C. 1450-1452
作者:BANWELL, MARTIN G.、LAMBERT, JOHN N.、GULBIS, JACQUELINE M.、MACKAY, MAUREEN+
DOI:——
日期:——
Convergent total synthesis of (.+-.)-colchicine and (.+-.)-desacetamidoisocolchicine
作者:D. A. Evans、S. P. Tanis、D. J. Hart
DOI:10.1021/ja00409a032
日期:1981.9
Total syntheses of (&)-desacetamidoisoolchicine (2b) and (&)-colchicine (la) have been achieved. Key features of the synthetic sequence are the facile incorporation of a tropolone dication equivalent via ketone 6 and introduction of the 7-acetamido group. Some of the mechanistic details of the conversion of alcohol 7 to dihydrotropolone 8 and alcohols 14a,b to ester 19 are discussed. Colchicine (la)