[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[NH:6][C:7]([NH2:9])=S.CI.[CH3:12][O:13][C:14]1[CH:21]=[CH:20][CH:19]=[CH:18][C:15]=1[CH2:16][NH2:17]>CO.C(O)C>[CH3:12][O:13][C:14]1[CH:21]=[CH:20][CH:19]=[CH:18][C:15]=1[CH2:16][NH:17][C:7]([NH:6][C:2]1[S:1][CH:5]=[CH:4][N:3]=1)=[NH:9]400 mg (2.51 mmol) N-1,3-thiazole-2-yl-thiourea were suspended in 20 ml of methanol and 392 mg (2.76 mmol) methyl iodide were added. The reaction mixture was stirred for 4 hours at reflux. Following removal of the solvent by vacuum distillation, the residue obtained was dissolved in 20 ml ethanol, 1.72 g (12.6 mmol) 2-methoxybenzylamine were added and the mixture was stirred for 20 hours at reflux. The solvent was removed on the rotovap. The residue was separated by preparative HPLC(RP-18 column, eluent water/acetonitrile/0.1% acetic acid) and 380 mg N-(2-methoxybenzyl)-N′-1,3-thiazole-2-ylguanidine were obtained.
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