Syntheses of isotopically labelled angiotensin II receptor antagonist GR138950X
摘要:
Syntheses of [C-13] and [C-14]-labelled versions of angiotensin II receptor antagonist GR138950X, labelled in the imidazole carboxamide residue, are described. These involved preparation of an iodoimidazole substrate by a novel iododecarboxylation procedure, followed by cyanation with a mixture of carbon-labelled potassium cyanide and copper (I) iodide in DMF at high temperature. The preparation of a mass-labelled (M+5) version of GR138950X is also described. This involved the synthesis of an [C-13(3), N-15(2)]-labelled imidazole from a 1,2,3-tricarbonyl compound, C-13(3)]propionaldehyde and [N-15]ammonia. The labelled imidazole was further elaborated into multiply-labelled GR138950X.
A convenient method for cyanation of aromatic iodo compounds
作者:Richard M Carr、Karl M Cable、Guy N Wells、Derek R Sutherland
DOI:10.1002/jlcr.2580340910
日期:1994.9
A variety of [13C]-labelled aromatic nitriles have been prepared in good yield from iodoaromatic substrates. Cyanation was achieved by reaction of aryl iodides with a mixture of potassium [13C]-cyanide and copper (I) iodide in an aprotic solvent at high temperature. The use of pre-prepared carbon-labelled copper (I) cyanide was therefore obviated.