作者:T. P. C. Mulholland、R. Foster、D. B. Haydock
DOI:10.1039/p19720001225
日期:——
A synthesis of four tetronic acids [furan-2(3H),4(5H)-diones] is described. On treatment with triethylamine the readily prepared diethyl α-(chloroacetyl)malonate yielded ethyl 2-ethoxy-4,5-dihydro-4-oxofuran-3-carboxylate (ca. 50%), which was converted into tetronic acid by alkali, and into 3-ethoxycarbonyltetronic acid by water, in high yields. 5-Methyl-, 5-phenyl-, and 5-ethyl-tetronic acids were
描述了四种tetronic酸[呋喃-2(3 H),4(5 H)-二酮]的合成。用三乙胺处理后,易于制备的α-(氯乙酰基)丙二酸二乙酯产生2-乙氧基-4,5-二氢-4-氧呋喃-3-羧酸乙酯(约50%),并通过碱将其转化为tetronic酸。用水将其转化为3-乙氧基羰基四氢苯甲酸,收率很高。类似地制备5-甲基-,5-苯基-和5-乙基-tetronic酸。最后的化合物也可以通过将5-亚乙炔异戊二酸加氢而获得。