S-Alkyl-N-alkylisothioureas were efficiently synthesized via synthetic approach (A) using 3-phenylpropionyl isothiocyanate (PPI). The utility of the approach was proved by the syntheses of clobenpropit, a potent histamine H3 antagonist, and its analogues. Alternatively, clobenpropit could be prepared via intramolecular amide cleavage (B) with use of 2-nitrophenylacetyl isothiocyanate (NPAI).
使用3-苯基丙酰基异
硫氰酸酯(P
PI),通过合成方法(A)有效地合成了S-烷基-N-烷基异
硫脲。该方法的实用性由强效
组胺H 3拮抗剂Clobenpro
PIt及其类似物的合成证明。备选地,可以使用2-
硝基苯基乙酰基异
硫氰酸酯(NPAI)通过分子内酰胺裂解(B)来制备
氯苯甲酸酯。