14C-Labeled 1,2-dihydro-5-imidazo [1,2-a]pyridin-6-yl-6-methyl-2-oxo-3-pyridinecarbonitrile hydrochloride monohydrate 6 was synthesized in 5 steps from 6-bromoimidazo [1,2-a] pyridine using [2-14C] cyanoacetamide as the source of the radiolabel. The key intermediate, 1-imidazo [1,2-a] pyridin-6-yl-2-propanone 3 was prepared by the selective ozonolysis of the propenyl group of 6-(2-methylpropen-3-yl) imidazo [1,2-a] pyridine 2 under acidic conditions followed by the reduction with sodium sulfite. The chemical yield of 6 from 4-dimethylamino-3-imidazo-[1,2-a]pyridin-6-yl-3-buten-2-one 4 and the radiochemical yield from [2-14C] cyanoacetamide were both 57%. The radiochemical purity and the specific activity of 6 were 98% and 1868.5 MBq/mmol, respectively.
A synthetic procedure for producing 14C-labelled milrinone is described. The synthesis was achieved in two steps from 1-(4-pyridyl)propan-2-one utilising [2-14C]cyanoacetamide as the source of the radiolabel. The overall chemical yield was 46% and the radiochemical yield 35%.
Preparation of 5-amino-3,4-bipyridin-6(1H)-one-514C. A new cardiotonic agent
作者:Franklyn W. Gubitz
DOI:10.1002/jlcr.2580180518
日期:1981.5
Inocor™ brand of amrinone1 (5-amino-3,4-bipyridin-6(1H)-one-514C) a new positive inotropic agent was obtained [14C] labelled at Carbon 5 in 55% overall yield.