| 摘要 |
1377747 Azido substituted carboxylic acids HOWSON-ALGRAPHY Ltd 17 Oct 1972 [22 Oct 1971] 49297/71 Heading C2C [Also in Divisions C3 and G2] The preparation of the following acids and their acid chlorides is disclosed: 4-azido-α- bromo-#-chlorocinnamylidene acetic acid (I); 4 - azido - 8 - chlorocinnamylidene acetic acid; 4 - azido - α - cyano - 8 - chlorocinnamylidene acetic acid; 4-azido-α-cyano-cinnamylidene acetic acid; 3-azido-benzylidene-α-cyanoacetic acid; 4 - azido - 2 - chlorobenzylidene - α- cyanoacetic acid; 4-azido-3,5-dibromobenzylidene - α - cyanoacetic acid; 3 - azido - 4- methyl - benzylidene - α - cyano acetic acid; 3 - azido - 4 - methoxy - benzylidene - α - cyano acetic acid; and 4 - azido - benzylidene - α- bromo-cyano acetic acid. In an example I is prepared by reacting 4-azido-#-chlorocinnamaldehyde (cf. U.S. Specification 3,598,844) dissolved in glacial acetic acid with cyano acetic acid. The acid chloride is obtained by further reaction with thionyl chloride. |
