Organic fluorine compounds. Part XXXIX. Reactions of α-fluoro-β-keto-esters
作者:Ernest D. Bergmann、Israel Shahak、Izchak Gruenwald
DOI:10.1039/j39670002206
日期:——
Ethyl 2,4-difluoroacetoacetate, ethyl ethoxalylfluoroacetate and the analogous benzyl ester gave the normal Wittig reaction with triethyl phosphonoacetate, whilst ethyl formylfluoroacetate gave a dimer of diethyl 4-fluoroprop-1-ene-1,3-dicarboxylate. Treatment of the sodio-enolate of ethyl formylfluoroacetate with acid chlorides gives 3-acyloxy-2-fluoroacrylates. The acyloxy-group of these compounds
2,4-二氟乙酰乙酸乙酯,乙草酰氟乙酸乙酯和类似的苄基酯与膦酰基乙酸三乙酯进行正常的维蒂希反应,而甲酰基氟乙酸乙酯得到4-氟丙-1-烯-1,3-二羧酸二乙酯的二聚体。用酰基氯处理甲酰氟乙酸乙酯的钠-烯酸酯,得到3-酰氧基-2-氟丙烯酸酯。这些化合物的酰氧基可以容易地被芳族胺取代,此外,它们可以用于合成嘧啶,例如5-氟尿嘧啶。