bromolactones (5) stereoselectively produced by the asymmetric bromolactonisation of (S)-N-(α,β-unsaturated) acylprolines(3), were elaborated to highly opticallyactive 2(R),3(S)-epoxyaldehydes(8)(84–98% ee) by successive epoxide formation and reductive cleavage of the proline moiety. The overall process constitutes a highly efficient asymmetric synthesis of 8 from α,β-unsaturated acids(1).
Novel process for asymmetric synthesis of optically active
申请人:Sumitomo Chemical Company, Limited
公开号:US04212828A1
公开(公告)日:1980-07-15
A process for asymmetric synthesis of optically active 2-alkanoyl-1,2,3,4-tetrahydro-2-naphthol compounds of the formula: ##STR1## from L-proline or its ester and the following carboxylic acid of the formula: ##STR2## or its reactive derivative through the following intermediary compounds in order: ##STR3##