Crystal structure of 2,3-dimethoxy-5,6,7,8,13,13a-hexahydro-6a,8-diazaindeno[2,1-b]phenanthrene methanol monosolvate

Abstract

The asymmetric unit of the title solvate, C21H22N2O2·CH3OH, contains one methanol solvent molecule and one molecule of the heterocycle that is built up by the fusion of four six-membered rings A, C, D, E and one five-membered ring B. The indole moiety (rings A and B) is essentially planar, with an r.m.s. deviation of 0.013 Å, whereas rings C and D adopt a twisted conformation with a trans-ring junction. In the crystal, two heterocyclic molecules are associated with two methanol molecules through mutual N—H...O and O—H...N hydrogen bonds, forming a centrosymmetric dimer.

Keywords

• crystal structure
• indole alkaloid
• isoquinoline alkaloid
• hydrogen bonding