Reaction of ethyl 4-halo-3-oxobutanoate with diethyl malonate, methyl cyanoacetate, and malononitrile.
作者:TETSUZO KATO、HITOSHI KIMURA、KENICHI TANJI
DOI:10.1248/cpb.26.3880
日期:——
Ethyl 4-bromo (and chloro)-3-oxobutanoate (1 and 2) reacts with diethyl malonate in the presence of sodium hydride to give diethyl 5-ethoxycarbonyl-3-oxohexanedioate (3) and diethyl 5-carboxy-3-oxohexanedioate (4). Similarly, reaction of the haloester (1, 2) with methyl cyanoacetate gives 1-ethyl methyl 5-cyano-3-oxohexanedioate (6) and 1-ethyl hydrogen 5-cyano-3-oxohexanedioate (7). On the other hand, 1 reacts with malononitrile in the presence of triethylamine to give ethyl 5-amino-4-cyanofuran-2-acetate (8) and ethyl 3-amino-2, 4, 4-tricyano-2-cyclopenten-1-ylideneacetate (9).
4-溴(和氯)乙氧基羰基-3-氧代丁酸乙酯(1和2)在氢化钠存在下与丙二酸二乙酯反应,生成5-乙氧基羰基-3-氧代己二酸二乙酯(3)和5-羧基-3-氧代己二酸二乙酯(4)。类似地,卤代酯(1, 2)与氰基乙酸甲酯反应生成1-乙基-5-氰基-3-氧代己酸甲酯(6)和1-乙基-5-氰基-3-氧代己酸(7)。另一方面,1在三乙胺存在下与丙二腈反应,生成乙基5-氨基-4-氰基呋喃-2-乙酸酯(8)和乙基3-氨基-2, 4, 4-三氰基-2-环戊烯-1-亚基乙酸酯(9)。