SYNTHESIS OF HISTAMINE DIHYDROCHLORIDE

摘要

The invention disclosed herein relates to the preparation of pharmaceutical grades of histamine dihydrochloride using a two step non-enzymatic synthetic method. The invention disclosed herein describes the synthesis of histamine dihydrochloride by the non-enzymatic decarboxylation of histidine and the st ep- wise conversion of the decarboxylated product to the dihydrochloride salt form. The invention disclosed herein considers a final product of histamine dihydrochloride containing less than each of the following: 0.8 % L-histidin e HCI monohydrate, 0.1 % individual chromatographic impurities, and 2 % total impurities, to be acceptable for pharmaceutical use.