摘要:
Synthetic approaches to 1H-imidazol-2-yl and 1H-benzoimidazol-2-yl phosphinic and phosphonic acids and their derivatives are reported, based on phosphorylation of N-protected heterocylcles by PhPOCl2 or MePOCl2. Reaction of N-alkylbenzoimidazoles with POCl3 did not lead to C-phosphorylated products in a reasonable yield, [2,2']-bis-benzoimidazolyles being formed instead.