A practical access to chiral phenylisoserinates, preparation of Taxotere® analogs
摘要:
A practical diastereoselective synthesis of phenylisoserine methyl esters 8a-c is described using alpha-methyl-benzylamine as the chiral template of a Staudinger reaction. Optically pure diastereoisomers 6a-c were easily recovered by crystallization. After opening of these intermediate azetidinones by hydrochloric acid and methanol, regioselective cleavage of the chiral auxiliary was achieved by hydrogenation over palladium. Phenylisoserinates 8b,c were used to prepare analogs of Taxotere(R).
A practical access to chiral phenylisoserinates, preparation of Taxotere® analogs
摘要:
A practical diastereoselective synthesis of phenylisoserine methyl esters 8a-c is described using alpha-methyl-benzylamine as the chiral template of a Staudinger reaction. Optically pure diastereoisomers 6a-c were easily recovered by crystallization. After opening of these intermediate azetidinones by hydrochloric acid and methanol, regioselective cleavage of the chiral auxiliary was achieved by hydrogenation over palladium. Phenylisoserinates 8b,c were used to prepare analogs of Taxotere(R).
Process for the preparation of .beta.-phenylisoserine and .beta.-lactam
申请人:Rhone-Poulence Rorer S.A.
公开号:US05939561A1
公开(公告)日:1999-08-17
The present invention relates to new process for the preparation of .beta.-phenylisoserine and its analogues of general formula: ##STR1## which are particularly useful for preparing taxane derivatives which have remarkable antitumour and antileukaemic activities.
Process for the preparation of .beta.-phenylisoserine and its analogues
申请人:Rhone-Poulenc Rorer S.A.
公开号:US05608102A1
公开(公告)日:1997-03-04
This invention relates to a method for preparing .beta.-phenylisoserine and analogues thereof having general formula (I) ##STR1## from an aromatic aldehyde and an .alpha.-methylarylamine-S, and through a lactam of general formula (II) as described herein. The acids of general formula (I) (R.dbd.H) may be used to prepare taxane derivatives having remarkable antitumoral and antileukaemic activity.