Oxidative process for preparing narwedine derivatives
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United States of America Patent
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Jul 4, 2000
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N/A
app pub date -
Jul 16, 1997
filing date -
Apr 3, 1995
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Abstract
The subject invention concerns a process for the preparation of a compound of formula (2), which comprises phenolic oxidation of a compound of formula (1) wherein X.sup.1 and X.sup.2 are independently selected from H or a protecting group for the phenolic function, e.g. acyl or trialkylsilyl; groups A.sup.1, A.sup.2, B.sup.1, B.sup.2 and Y are selected so as to render the nitrogen atom non-basic; Z is a blocking group, e.g. Br or t-butyl; and R is H, C.sub.1-20 alkyl, C.sub.3-20 aryl, C.sub.4-20 arylalkyl, and wherein the process is carried out in a two-phase liquid system comprising an aqueous base and an organic solvent having a dielectric constant below 4.8.
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