Journal
ORGANIC LETTERS
Volume 4, Issue 6, Pages 885-888Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol017114f
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[GRAPHICS] Novel synthesis of cephalotaxine 1 based on tertiary N-acyliminium ion chemistry starting from alkynylamide 2 was achieved. The key steps include the preparation of pyrroloisoquinoline 4 from alkynylamide 2, the ring expansion of pyrroloisoquinoline 4 to pyrrolobenzazepine 12, and the construction of cyclopentapyrrolobenzazepine ring system 6, all of which are derived from N-acyliminium ion intermediates.
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