Indirect Identification of 4,21–Dehydrocorynantheine Aldehyde as an Intermediate in the Biosynthesis of Ajmalicine and Related Alkaloids

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Abstract
In the pesence of BH4 – an enzyme preparation of Catharanthus roseus cell suspension cultures transformes strictosidine (1), to sitsirikine (11a) and 16–isositsirikine (11b) which are derived from 4,21–dehydrocorynantheine aldehyde (5), an intermediate in the formation of heteroyohimbine type alkaloids.