Total synthesis of dehydroambliol-A and its unnatural Z isomer
摘要:
Convergent total syntheses of dehydroambliol-A (1a), its unnatural Z isomer 1b, and ambliofuran (2) are described. The syntheses utilized 2-(3'-furyl)-1,3-dithiane (6) as a common intermediate. Analysis of their proton and carbon magnetic resonance spectra confirm that in the natural product dehydroambliol-A and in synthetic dehydroambliol-A the DELTA-7-bond possesses the E geometry, while in the unnatural isomer of dehydroambliol-A, the DELTA-7-bond is of the Z configuration.
Sulphone-based elimination reactions in synthesis. Part 2. Diumycinol
作者:Philip Kocienski、Michael Todd
DOI:10.1039/p19830001783
日期:——
Diumycinol [2(Z), 6(E)-12-(2-methylene-6,6-dimethyl-1-cyclohexyl)-11-methylene-3,8,8-trimethyldodeca-2,6-dien-1-ol], a hydrolytic product of the antibiotic diumycin, was assembled from three fragments: 1-(2-phenylsulphonylethyl)-2-methylene-6,6-dimethylcyclohexane (28), 3-(2-iodoethyl)-3-methyloxetane (39), and (Z)-1-benzyloxy-6-phenylsulphonyl-3-methylhex-2-ene (3). An efficient synthesis of 2-methylene-6