Synthesis of 2-Functionalized 4-(Diethoxyphosphorylmethyl)-5-(1-bromoalkyl)furans and Their Reactions with Amines
作者:L. M. Pevzner
DOI:10.1007/s11176-005-0317-8
日期:2005.5
lfuran-2-carboxylic acids with triethyl phosphite yields the corresponding phosphonates. These compounds are brominated with N -bromosuccinimide in carbon tetrachloride at the α-position of the alkyl radical. The resulting 2-(1-bromoethyl)-, 2-(1-bromopropyl)-, and 2-(1-bromoisobutyl)furans react with secondary amines following the scheme of nucleophilic substitution. The dehydrobromination product
用亚磷酸三乙酯将4-氯甲基-5-烷基呋喃-2-羧酸的酯和腈进行磷酸化,得到相应的膦酸酯。这些化合物在烷基基团的α位被四氯化碳中的 N-溴丁二 酰亚胺溴化 。按照亲核取代的方案,所得的2-(1-溴乙基)-,2-(1-溴丙基)-和2-(1-溴异丁基)呋喃与仲胺反应。仅在4-(二乙氧基磷酰基甲基)-5-(1-溴异丙基)呋喃-2-甲酸乙酯与三乙胺的反应中分离出脱氢溴化产物,但收率低。溴代膦酸酯与碳酸锂在DMF中的反应导致其分解。