TBAHS-Catalyzed Synthesis of 2-Dihydroquinazolin-2-ylquinoline: An Efficient and Practical Synthesis of Naturally Occurring Alkaloids Luotonin A, B, and E

[摘要]：A synthesis of 2-dihydroquinazolin-2-ylquinoline using a phase-transfer catalyst (TBAHS) in semi-aqueous phase, followed by Mitsunobu cyclization as key steps for an efficient and practical synthesis of naturally occurring alkaloids luotonin A, B, and E starting from o-nitrobenzaldehyde is reported. The new approach presents the advantage of a shorter route with high overall yield (57%, 45%, and 37%, respectively) and ease of operation.

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