Heterocyclizations of functionalized heterocumulenes with C,N-, C,O-, and C,S-binucleophiles: XIII. Synthesis of dialkyl 2-oxo-3-allyl-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates and their reaction with arylhydroxymoyl chlorides
摘要:
Dialkyl 2-oxo-3-allyl-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates obtained by condensation of 1-chlorobenzyl isocyanates with N-allylfumarates reacted regioselectively with arylhydroxymoyl chlorides with the formation of dialkyl 6-aryl-3-[(3-aryl-4,5-dihydro-5-isoxazolyl)methyl]-2-oxo-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates.
本文介绍了一种高效,环保的合成β-氨基羰基化合物的方法。在不存在任何催化剂的情况下,通过使用无溶剂的氮杂-迈克尔加成反应,由氧杂冰片烯和胺成功地制备了氧杂冰片烯β-氨基酯和β-烯胺酯。氧杂降冰片烯β-氨基酯是室温下的主要产物,但较高的温度(例如90°C)导致形成β-烯胺酯。此外,所有目标化合物均通过IR,1 H NMR,13 C NMR和HR-MS表征。还提出了可能的反应途径。