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Conformational Studies of Hexahydro‐benzo[c]phenanthridine Alkaloids: Solid and Solution Conformations of Deoxycorynoline

The conformation of (±)‐deoxycorynoline (4), which was derived from (±)‐corynoline (1), was investigated by X‐ray crystallographic analysis. The crystal structure of (±)‐4 exists in B/C „anti‐cis”︁ conjunction, half‐chair of ring B and twist‐half‐chair of ring C, and shows the same conformation as that of the parent alkaloid (±)‐1. Conformational analyses of CD spectra in solution suggested that (+)‐4, derived from (+)‐1, has essentially the same conformation as in the crystal state of (±)‐4. The CD spectrum of (+)‐4 shows a slight temp.‐dependence, whereas that of (+)‐1 shows no dependency under the same conditions.