Preparation of P-chirogenic phospholanes and their use in asymmetric synthesis
申请人:Hoge Stewart Garrett
公开号:US20050222464A1
公开(公告)日:2005-10-06
Materials and methods for preparing P-chirogenic monophospholanes and bisphospholanes are disclosed. The methods employ stereoselective cyclization to generate the phospholane rings followed by pyramidal inversion to access a variety of P-chirogenic phospholanes. When bound to transition metals such as rhodium, the disclosed P-chirogenic phospholanes may be used as catalysts in asymmetric synthesis of valuable pharmaceutical chemical entities, including pregabalin.
Stereoselective Cyclization and Pyramidal Inversion Strategies for P-Chirogenic Phospholane Synthesis
作者:Garrett Hoge
DOI:10.1021/ja048079l
日期:2004.8.1
Preparation of P-chirogenic mono- and bisphospholanes is reported. The demonstrated method employs a stereoselective cyclization of cyclic sulfates with primary phosphines in the presence of base to generate "cis" or "cis/cis" P-chirogenic phospholanes followed by heat-induced pyramidal inversion to provide "trans" or "trans/trans" P-chirogenic phospholanes. A rhodium complex of one "trans/trans" phospholane