Patent ID: 10738058

Abstract:
The present invention discloses a method of manufacturing 4-chloro-7H-pyrrolo[2,3-d]pyrimidine comprising the steps: a) Preparing ethyl 2-cyano-4,4-dimethoxybutanoate by coupling ethyl 2-cyanoacetate and 2-bromo-1,1-dimethoxyethane; b) Preparing 6-amino-5-(2,2-dimethoxyethyl)pyrimidin-4-ol by adding formamidine to ethyl 2-cyano-4,4-dimethoxybutanoate; c) Converting 6-amino-5-(2,2-dimethoxyethyl)pyrimidin-4-ol to 7H-pyrrolo[2,3-d]pyrimidin-4-ol; and d) Converting the 7H-pyrrolo[2,3-d]pyrimidin-4-ol to 4-chloro-7H-pyrrolo[2,3-d]pyrimidine. The method offers increased yield, less by-products and a decrease in waste compared to methods known as being state of the art.