Racemic monomorine (12) is prepared in six steps in 26% overall yield from 2‐butyl‐1H‐pyrrole and ethyl (E)‐but‐2‐enoate by exploiting the rhodium(II)‐acetate‐catalyzed decomposition of (4RS)‐4‐(2′‐butyl‐1′ H‐pyrrol‐1′‐yl)‐1‐diazopentan‐2‐one (7).
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Jefford et al. (1989) studied this question.
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