7 beta-substituted 6a, 14a-ethenomorphinans and 7beta-substituted 6a, 14a-ethanomorphinans
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United States of America Patent
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Dec 5, 2017
Grant Date -
Mar 10, 2016
app pub date -
Dec 23, 2013
filing date -
Dec 31, 2012
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Abstract
The application is directed to a process for increasing the proportion of 7β-epimer in an 7α/7β-epimer mixture of a 7-substituted 6α,14α-ethenomorphinan or a 7-substituted 6α,14α-ethanomorphinan, and specifically of compounds of Formula (I), wherein G, R2-R4, and are defined as set forth in the specification. The application is also directed to a process for purifying the 7β-epimer from an 7α/7β-epimer mixture of a 7-substituted 6α,14α-ethenomorphinan or a 7-substituted 6α,14α-ethanomorphinan. The application is also directed to a process for preparing 7β-substituted compounds of Formula Vb wherein G and R2-R5 are defined as set forth in the specification.
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