Synthesis and Chemical Reactions of α -Cyano -α -isocyanoalkanoic Acids.Caretα-Cyano-α-isocyanoalkanoic acid esters 5 were synthesizedin very good yields starting from alkyl α-cyano-α-(formylamido)acetates 3 by alkylation of theappropriate enolates followed by dehydration with trichloromethylchloroformate(diphosgene)/triethylamine at low temperatures. Bromination of these estersgave α-cyano-α-(dibromomethylideneamino)alkanoicacid esters 6 in quantitative yields. Reduction of 6with magnesium led to 5.
α-
氰基-α-异
氰基链烷酸的合成和
化学反应。Caretα-
氰基-α-异
氰基链烷酸酯 5 是从烷基 α-
氰基-α-(甲酰胺基)
乙酸酯 3 开始合成的,收率非常高适当的烯醇化物烷基化,然后用
氯甲酸三氯甲酯(双
光气)/
三乙胺在低温下脱
水。这些酯的
溴化产生了定量产率的α-
氰基-α-(二
溴亚甲基
氨基)链烷酸酯6。用
镁将 6 还原为 5。