An unexpected rearrangement of the benzofurobenzazepine skeleton of galanthamine-type alkaloids
摘要:
Attempted cyclisation of N-methylated Spiro benzazepine-cyclohexenone (5) into the corresponding N-methyl tetracyclic unit of galanthamine-type alkaloids (6) instead gave an unexpected rearrangement to yield a cyclopentanoisoquinolinone derivative (7). Methylation of the tetrahydrobenzofurobenzazepine tetracycle resulted in the expected N-methyl derivative 6, and the anomalous product 8, with structure similar to that of 7. (C) 2010 Elsevier Ltd. All rights reserved.
An unexpected rearrangement of the benzofurobenzazepine skeleton of galanthamine-type alkaloids
摘要:
Attempted cyclisation of N-methylated Spiro benzazepine-cyclohexenone (5) into the corresponding N-methyl tetracyclic unit of galanthamine-type alkaloids (6) instead gave an unexpected rearrangement to yield a cyclopentanoisoquinolinone derivative (7). Methylation of the tetrahydrobenzofurobenzazepine tetracycle resulted in the expected N-methyl derivative 6, and the anomalous product 8, with structure similar to that of 7. (C) 2010 Elsevier Ltd. All rights reserved.