NEW ASPIDOFRACTININE, ASPIDOSPERMATAN AND AKUAMILINE INDOLE ALKALOIDS FROM THE ROOTS OF KOPSIA SINGAPURENSIS RIDL.

[摘要]：Three new aspidofractinines; N(1)-formylkopsininic acid (1), N(1)-formylkopsininic acid-N(4)-oxide (2), 15-hydroxykopsamine (3), a new aspidospermatan; 14 alpha-hydroxy-N(4)-methylcondylocarpine (4) and a new akuamiline; singaporentinidine (5) type indole alkaloids were isolated from the roots of Kopsia singapurensis. Their structures were determined on the basis of the 2D NMR and chemical correlations.

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