Abstract
A compound, which accumulates when tryptamine (I) and secologanin (II) are incubated with an enzyme preparation from Catharanthus roseus cell suspension cultures, was identified as 20,21-didehydroajmalicine (cathenamine)(IVa), and was shown to be a central intermediate in the enzymatic production of ajmalicine (Va),19-epi-ajmalicine (Vb) and tetrahydroalstonine (Vc).
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