Solvent-Free Synthesis of Monastrol Derivatives Catalyzed by NaHSO4

[摘要]：Monastrol derivatives were synthesized by environment-friendly three component condensation reaction of salicylaldehyde analogues, beta-ketoester, and urea or thiourea under solvent-free conditions with NaHSO4 as catalyst in high yields. The reactions formed two different monastrol products, 4-(2-hydroxyphenyl)pyrimidines 4 and 9-methyl-11-oxo(or thioxo)-8-oxa-10,12-diazatricyclotrideca derivatives 5.

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