Efficient Approaches to <i>S</i>-Alkyl-<i>N</i>-alkylisothioureas: Syntheses of Histamine H<sub>3</sub> Antagonist Clobenpropit and Its Analogues
作者:Hiroki Yoneyama、Ayako Shimoda、Lisa Araki、Kouta Hatano、Yasuhiko Sakamoto、Takushi Kurihara、Atsushi Yamatodani、Shinya Harusawa
DOI:10.1021/jo702181x
日期:2008.3.1
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(PPI),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Clobenpropit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。