Total synthesis of (.+-.)-crassin by titanium-induced pinacol coupling
作者:John E. McMurry、R. G. Dushin
DOI:10.1021/ja00206a031
日期:1989.11
L'etape cle de la synthese est la copulation de carbonyles catalysee par TiCl 3 (dme) (dme=monoglyme)
L'etape cle de la synthese est la copulation de carbonyles catalysee par TiCl 3 (dme) (dme=monoglyme)
MCMURRY, JOHN E.;DUSHIN, RUSSELL G., J. AMER. CHEM. SOC., 112,(1990) N9, C. 6942-6949
作者:MCMURRY, JOHN E.、DUSHIN, RUSSELL G.
DOI:——
日期:——
Total synthesis of (.+-.)-isolobophytolide and (.+-.)-crassin by titanium-induced carbonyl coupling
作者:John E. McMurry、Russell G. Dushin
DOI:10.1021/ja00175a031
日期:1990.9
Syntheses of the antitumor cembrane lactones (±)-crassin (1) and (±)-isolobophytolide (2) are reported. The key steps are the titanium-induced pinacol coupling of lactone keto aldehydes 3c and 3t to yield macrocyclic diols without harming the lactone rings also present in the molecules. Compound 3t yields a diol (18a) that is converted into isolobophytolide by epoxide formation and methylenation. Compound