Thermal reactions of cyclopropenone ketals. Application of the cycloaddition reactions of delocalized singlet vinylcarbenes: three-carbon 1,1-/1,3-dipoles. An alternative synthesis of deacetamidocolchiceine: formal total synthesis of colchicine
作者:Dale L. Boger、Christine E. Brotherton
DOI:10.1021/ja00281a042
日期:1986.10
Natural products. Antitubulin effect of congeners of <i>N</i>-acetylcolchinyl methyl ether: synthesis of optically active 5-acetamidodeaminocolchinyl methyl ether and of demethoxy analogues of deaminocolchinyl methyl ether
作者:O. Boyé、A. Brossi、H. J. C. Yeh、E. Hamel、B. Wegrzynski、V. Toome
DOI:10.1139/v92-160
日期:1992.5.1
were synthesized by four different routes: (1) Synthesis of 4 was achieved from 2,3-dimethoxybenzaldehyde via biphenyl aldehyde 17, chain lengthening to propionicacid 20, acid-catalyzed cyclization toward ketone 21, and removal of the carbonyl group. (2) Compound 5 was obtained by eliminating the sterically most hindered methoxy group in 25 or 26 by metal reduction in alcohol. (3) Compound 6 was prepared