Abstract
A potent histamine H3 receptor antagonist OUP-186 with an S-alkyl-N-alkylisothiourea structure was synthesized using 3-phenylpropanoyl isothiocyanate (PPI) as an SCN source. The synthetic route was significantly improved by replacing 3-phenylpropanoyl isothiocyanate with 2-nitrophenylacetyl isothiocyanate (NPAI), giving a 74% overall yield in three steps from 4-(4-chlorophenyl)butylamine. In addition, the 2-nitrophenylacetyl isothiocyanate method successfully yielded two fluorine-containing analogues, and a shorter, C2 homologue of OUP-186.
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