A Concise Total Synthesis of (±)-Bakkenolide A by Means of an Intramolecular Diels−Alder Reaction
作者:Thomas G. Back、Joseph E. Payne
DOI:10.1021/ol990747y
日期:1999.8.1
(+/-)-Bakkenolide A was prepared in five steps from ethyl 4-benzyloxyacetoacetate by sequential alkylations with tiglyl bromide nd cis-5-bromo-1,3-pentadiene, followed by an intramolecular Diels-Alderreaction as the key step. The known 7-epibakkenolide A and novel 10-epi- and 7,10-diepibakkenolide A stereoisomers were obtained as minor byproducts.
Davies, Alwyn G.; Griller, David; Ingold, Keith U., Journal of the Chemical Society. Perkin transactions II, 1981, p. 633 - 641
作者:Davies, Alwyn G.、Griller, David、Ingold, Keith U.、Walton, John C.、Lindsay, David A.
DOI:——
日期:——
Synthesis of (±)-Bakkenolide-A and Its C-7, C-10, and C-7,10 Epimers by Means of an Intramolecular Diels−Alder Reaction
作者:Thomas G. Back、Victor O. Nava-Salgado、Joseph E. Payne
DOI:10.1021/jo015624h
日期:2001.6.1
cases exo cyclization was preferred over endo. An alternative approach was based on a similar intramolecular Diels-Alder cycloaddition, using dimethyl malonate instead of ethyl 4-benzyloxyacetoacetate as the starting material for the double alkylation preceding the cycloaddition step. The cycloadduct was then converted into the corresponding alpha-phenylseleno propargyl esters 16 or 22. However, attempted