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■ Unambiguous Carbon-13 NMR Assignments of Some Biologically Active Protoberberine Alkaloids

Raouf A. Hussain, Jinwoong Kim, Christpher W. W. Beecher, and A. Douglas Kinghorn*

*Program for Collaborative Research in the Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, 833 South Wood St., Chicago, IL 60612-7231, U.S.A.

Abstract

Unambiguous proton and carbon-13 nmr chemical shifts of the protoberberine quaternary alkaloids palmatine (1) and jatrorrhizine (2) theilr, tetrahydro derivatives (3,4), and tetrahydroberberine (5) have been determined through the use of 2D, CSCM 1D and selective INEPT nmr techniques.