A stereoselective synthesis of corynantheine-type alkaloids via enamine annulation. Total synthesis of (±)-dihydrocorynantheol and formal total synthesis of (±)-corynantheine and (±)-ajmalicine
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 12,p. 3168-3175
- https://doi.org/10.1039/p19810003168
Abstract
Enamine annulation between 3,4-dihydro-1-methyl-β-carboline (4) and dimethyl 3-methoxyallylidenemalonate (5) yielded 2-(2,2-dimethoxyethyl)-2,3,4,6,7,12-hexahydro-3-methoxycarbonyl-4-oxoindolo [2,3-a]quinolizine (6), which was transformed into (±)-dihydrocorynantheol (1). (±)-Corynantheal (19), which is convertible into (±)-corynantheine (2) and (±)-ajmalicine (3), was stereoselectively synthesised from (6)via empimerisations at the angular position using Adams catalyst.Keywords
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