893419-47-1Relevant articles and documents
Synthesis of entacapone by Pd-catalyzed heck coupling reaction
Veerareddy, Arava,Reddy, Gogireddy Surendra
, p. 1274 - 1278 (2014/04/17)
Synthesis of entacapone from 4-iodo-2-methoxy-phenol with 2-cyano-N,N-diethylacrylamide by palladium-catalyzed Heck reaction, as a key step, is described.
Efficient approach to pure entacapone and related compounds
Srikanth,Ray, Uttam Kumar,Srinivas Rao,Gupta, P. Badarinadh,Lavanya,Islam, Aminul
scheme or table, p. 1359 - 1366 (2012/04/04)
A new and efficient process through a new intermediate, (2E)-2-cyano-3-(3,4-dihydroxy-5-nirtrophenyl)prop-2-enoic acid 15, has been described for preparing substantially pure entacapone 1. This new intermediate 15 was prepared by Knoevenagel condensation of 3,4-dihydroxy-5-nitrobenzaldehyde 2 with 2-cyanoacetic acid 14 and was further condensed with diethylamine to get pure entacapone 1. Some of the important process-related impurities of entacapone (17, 18, 19, and 20) were also prepared easily from this intermediate 15. Copyright Taylor & Francis Group, LLC.