Synthesis and diels-alder reactions of (S)-3-chloro and (S)-3-ethyl-2-p-tolylsulfinyl-1,4-benzoquinones
作者:M.Carmen Carreño、José L.García Ruano、Miguel A. Toledo、Antonio Urbano
DOI:10.1016/0040-4039(94)88379-3
日期:1994.12
The synthesis of the title compounds in enantiomericallypure form is described. Their cycloadditions with cyclopentadiene and 2,3-dimethyl-1,3-butadiene in the presence of ZnBr2 take place on the unsubstituted dienophilic double bond C5-C6 giving access to optically active 4a,5,8,8a-tetrahydronaphthoquinones with a diastereoisomeric excess ranging from 40 to 72%.