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2-Amino-4-chloro-6,7-dimethoxyquinazoline is a common key intermediate of some a-blocker anti-hypertension drugs including Prazosin, Doxazosin, and Terazosin. The preparation of 2-amino-4-chloro-6,7-dimethoxyquinazoline was first reported by Pfizer pharmaceutical company. Some modifications have been done in order to achieve economic scale-up and mass production towards those anti-hypertension drugs.
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