Treatment of N-dichloroacetyl amino acids with acetic anhydride at a temperature between 85°C and 130°C yielded 4-alkylidene- and 4-aralkylidene-2-chloromethyl-5-oxazolones, which were readily hydrolyzed to give 2-(2-chloroacetamido)-2-alkenoic acids, i.e., N-(chloroacetyl)-dehydroamino acids.
将N-二
氯乙酰
氨基酸与
醋酸酐在85°C至130°C的温度下处理,生成4-烷基烯烃和4-芳基烯烃-2-
氯甲基-5-
噁唑烷酮,这些化合物可以容易
水解生成2-(2-
氯乙酰
氨基)-2-烯酸,即N-(
氯乙酰)-脱
氨基酸。