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