Tetrahedron Letters p. 2127 - 2130 (1981)
Update date:2022-08-03
Topics:
Cragg, John E.
Hedges, Stuart H.
Herbert, Richard B.
Titanium (IV) chloride and silicon (IV) chloride with high oxygen affinity are the best Lewis acid catalysts, of a number tested, for cyclisation of an enamine-ketone (1) leading to the alkaloid, julandine (2); cyclisation of (6) in methanol solution without catalyst yields O-methylipalbidine (7).
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(1987)
