Tetrahedron Letters p. 1671 - 1674 (1996)
Update date:2022-08-16
Topics:
Ramana
Potnis, Prashant V.
Tandem acylation-cycloalkylation of 3,4-dimethoxy phenylethylamine (1) with cyclohexene-1-acetic acid (2) in polyphosphoric acid (PPA) afforded 8-(2-aminoethyl)-1,2,3,4,4a,10a-hexahydro-9-oxo-phenanthrene (3) which on cyclisation followed by dehydrogenation with Pd-C afforded dehydronornuciferine (5). Hydrogenation of 5 yielded (±) N-nornuciferine (6).
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