Facile conversion of 4-halogeno-1,3-dioxolan-2-ones to 2-oxazolidones.
作者:TSUTOMU MATSUURA、TAKEHISA KUNIEDA、TAKEO TAKIZAWA
DOI:10.1248/cpb.25.1225
日期:——
Telomers of vinylenecarbonate with tetrachloromethane, which possess the 4-chloro-1, 3-dioxolan-2-one structure as a terminal ring, underwent smooth and selective conversion with primary aliphatic amines into 5-substituted 4-hydroxy-2-oxazolidones whose chemical reactions with the aid of acids, dehydration and phenylation, led to the corresponding 4-oxazolin-2-ones and 4-phenyl-2-oxazolidones, respectively. Treatment of 5-trichloromethyl-2-oxazolidinone with zinc-methanol resulted in the exclusive formation of 5-dichloromethyl-2-oxazolidone, in contrast to the corresponding 1, 3-dioxolan-2-one system which suffered complete reductive ring-opening even under milder conditions.
碳酸亚乙烯基酯与四氯甲烷的调聚物具有 4-氯-1, 3-二氧戊环-2-酮结构作为端环,与脂肪伯胺顺利且选择性地转化为 5-取代的 4-羟基-2-恶唑烷酮,其化学性质借助酸、脱水和苯化反应,分别生成相应的4-恶唑啉-2-酮和4-苯基-2-恶唑烷酮。用锌-甲醇处理 5-三氯甲基-2-恶唑烷酮导致仅形成 5-二氯甲基-2-恶唑烷酮,而相应的 1, 3-二氧杂环戊烷-2-酮系统甚至会完全还原开环。在较温和的条件下。