Studies on steroidal plant-growth regulator 25. Concise stereoselective construction of sidechain of brassinosteroid from the intact sidechain of hyodeoxycholic acid: formal syntheses of brassinolide, 25-methylbrassinolide, 26, 27-bisnorbrassinolide and their related compounds
作者:Wei-Shan Zhou、Liang-Fu Huang
DOI:10.1016/s0040-4020(01)88509-4
日期:1992.1
A concise stereoselective construction of sidechain of brassinolide (1), 25-methylbrassinolide (3) and 26,27-bisnorbrassinolide (4), which involves beta-alkylative 1,3- carbonyl transposition of the alpha,beta-unsaturated ketones 11 and 34 and alpha, beta-unsaturated methyl ester 26, using the intact sidechain of hyodeoxycholic acid (2) as starting material, is described. The formal syntheses of 1, 3 and 4 were accomplished. In the mean time, 25-methylcastasterone (21), 26,27-bisnortyphasterol (6) and the new 25-methyltyphasterol (5) were also syntehesized.
Mori, Kenji; Takeuchi, Tadashi, Liebigs Annalen der Chemie, 1988, p. 815 - 818
作者:Mori, Kenji、Takeuchi, Tadashi
DOI:——
日期:——
MORI, KENJI;TAKEUCHI, TADASHI, LIEBIGS ANN. CHEM.,(1988) N 8, C. 815-818
作者:MORI, KENJI、TAKEUCHI, TADASHI
DOI:——
日期:——
Tsubuki, Masayoshi; Keino, Katsuyuki; Honda, Toshio, Journal of the Chemical Society. Perkin transactions I, 1992, # 20, p. 2642 - 2650