申请人:Rhone-Poulenc Rorer Pharmaceuticals Inc.
公开号:US05278323A1
公开(公告)日:1994-01-11
The present invention is directed to the synthesis of 2-chloro-cis-[5a(S)-9a(S)-(5a,6,7,8,9,9a-hexahydro)]dibenzofuran-4-carboxy lic acid by an intramolecular Heck stereospecific synthesis substantially free of undesirable 8-chloro-2,6-methano-2H-3,4,5,6-tetrahydro-1-benzoxocin-10-carboxylic.
本发明涉及通过一种分子内赫克立体特异合成方法合成2-氯-顺式-[5a(S)-9a(S)-(5a,6,7,8,9,9a-六氢)]二苯并呋喃-4-羧酸,该方法基本上不含有害的8-氯-2,6-甲基-2H-3,4,5,6-四氢-1-苯并氧杂环-10-羧酸。