Tetrahedron p. 6585 - 6602 (1994)
Update date:2022-08-04
Topics:
Diez, Anna
Castells, Josep
Forns, Pilar
Rubiralta, Mario
Grierson, David S.
et al.
A new and versatile synthesis of tetracyclic compounds 10, 22 and 24 presenting the ABED ring system of Strychnos alkaloids is described by closure of the C1-C11b bond in the key step.The intermediate tetrahydropyridinium salts 2 have been obtained from 2-(1,3-dithian-2-yl)indole (3) and either 2-cyano-3-ethyl-1-methyl-1,2,3,6-tetrahydropyridine (4a) or N-substituted Δ3-piperidein-2-ones (5).
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(2014)
