Reaction of ethyl 4,4,4-trifluoroacetoacetate enolate with 3-bromo-1,1,1-trifluoroacetone: synthesis of 2,4-bis (trifluoromethyl) furan
作者:Jonathan O. Smith、Braja K. Mandal、Robert Filler、James W. Beery
DOI:10.1016/s0022-1139(96)03518-x
日期:1997.3
2 in DMSO solution to yield three products. Ethyl 2,4-bis(trifluoromethyl)-4-hydroxydihydro-3-furoate 3 is generated via C-acylation. The hydrated trifluoromethyl ketone 4 is formed by O-alkylation and 4 reacts further with 2 to give the di-O-alkylated ketone hydrate 5. Compound 3 undergoes dehydration to the furan derivative 6 on reaction with Ac2O-ZnCl2.
4,4,4-三氟乙酰乙酸乙酯1的烯醇钾与3-溴-1,1,1-三氟丙酮2在DMSO溶液中反应生成三种产物。通过C-酰化产生2,4-双(三氟甲基)-4-羟基二氢-3-糠酸乙酯3。通过O-烷基化形成水合的三氟甲基酮4,并且4与2进一步反应以产生二-O-烷基化的酮水合物5。化合物3在与Ac 2 O-ZnCl 2反应时脱水成呋喃衍生物6 。