The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of pip...The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of piperidine; adding benzene in the reaction mixture to favor azeotropic dehydration. The optimum molar ratio of DBU/ethylacetoacetate/solid paraformaldehyde was 4∶20∶11.展开更多
文摘The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of piperidine; adding benzene in the reaction mixture to favor azeotropic dehydration. The optimum molar ratio of DBU/ethylacetoacetate/solid paraformaldehyde was 4∶20∶11.
