V. Dryanska et al., PREPARATION OF ETHYL-ESTERS OF PROTECTED 3-ARYL-2,3-DIAMINOPROPANOIC ACIDS BY REACTION OF ETHYL N-(DIPHENYLMETHYLENE)GLYCINATE AND AZOMETHINES, Synthetic communications, 27(11), 1997, pp. 1849-1856
Ethyl -arylamino-2-[(diphenylmethylene)amino]propanoates 3 are prepare
d by phase-transfer catalyzed reaction of ethyl N-(diphenylmethylene)-
glycinate and azomethines.