The reaction of alkenyl Grignard reagents with dialkyl oxalates at 80°C in an ether/tetrahydrofuran mixture (1:1) leads to the formation of the corresponding alkyl 2-oxo-3-alkenoates in high yields. Thus a mild and convenient one-step synthesis of 3-isopropenyl-substituted 2-oxoesters is described.
在
乙醚/
四氢呋喃混合溶剂(1:1)中,于80°C条件下,烯丙基
格氏试剂与二烷基
草酸酯反应,可高产率地生成相应的烷基2-氧代-3-烯酸酯。由此,描述了一种温和且便捷的一步合成3-异
丙烯基取代的2-氧代酸酯的方法。