processes for making zilpaterol and salts thereof

processes for making zilpaterol and salts thereof

  • CN 101,652,368 A
  • Filed: 03/28/2008
  • Published: 02/17/2010
  • Est. Priority Date: 03/31/2007
  • Status: Active Application
First Claim
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1. method for preparing zilpaterol or its salt, wherein said method comprises:

  • By the method preparation 2 that comprises the steps, 3-dihydro-2-oxo--1H-benzoglyoxaline-1-butyryl chloride (or its salt);

    make 4-(2-oxo-2,3-dihydrobenzo imidazoles-1-yl) butyric acid (or its salt) and at least a chlorination reaction that is selected from oxalyl chloride, phosgene and triphosgene;

    PerhapsBy the method preparation 4 that comprises the steps, the 5-dihydro-imidazol-is [4,5,1-jk] [1] benzo-aza also -2,6,7[1H]-triketone-6-oxime (or its salt);

    make 8,9-dihydro-2H, 7H-2,9a-diaza benzo [cd] Azulene-1,6-diketone (or its salt) and inorganic nitrous compound reaction.

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