Facile Generation of Alkenesand Dienes from Tosylates
作者:Martin E. Maier、Prodeep Phukan、Matthias Bauer
DOI:10.1055/s-2003-40210
日期:——
Several aldol products resulting from Evans aldol reactions were converted to primary alcohols. After conversion to the corresponding tosylates, heating with Nal and DBU in dimethoxyethane (glyme) effected clean elimination to the terminal olefin. This simple one-pot procedure was applied to other tosylates and a tosylate derived from a homoallylic alcohol. The latter gave rise to a diene.
The total synthesis of luminacin D (1) is reported on the basis of two aldol reactions to form the carbohydrate sector, aldehyde 30. Reaction of aldehyde 30 with the aryllithium intermediate derived from aryl iodide 38, cleavage of the silyl ether, and oxidation led to keto aldehyde 41. This advanced intermediate could be converted to luminacin 1 and its 6', 8'-epimer.