[CH2:1]([C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([CH2:9][CH3:10])[C:4]=1[NH:11][C:12]([NH:14][C:15](=[NH:18])[NH:16][CH3:17])=[O:13])[CH3:2].[CH3:19]N(C(OC)OC)C.[ClH:27].CO>CC#N>[ClH:27].[CH2:9]([C:5]1[CH:6]=[CH:7][CH:8]=[C:3]([CH2:1][CH3:2])[C:4]=1[N:11]1[CH:17]=[N:16][C:15]([NH:18][CH3:19])=[N:14][C:12]1=[O:13])[CH3:10]To a suspension of 22.8 g (80.0 mmol) of 1-(2,6-diethylphenyl)-3-methylamidinourea in CH3CN (100 ml) were added 19.1 g (160.0 mmol) of DMF-DMA and the reaction mixture was heated at reflux for 3 hours. The CH3CN was removed under reduced pressure and the residue partitioned between CHCl3 and H2O. The layers were separated and the aqueous layer extracted with CHCl3 (1×100 ml), dried (MgSO4) and concentrated under reduced pressure to give an off-white solid, which by NMR confirmed the desired free base. The solution was dissolved in H2OH and acidified with HCl/MeOH and the MeOH removed under reduced pressure to give an off-white solid which was crystallized from CH3CN to give after vacuum drying the weekend (105° C., house vacuum) 16.7 g (71%) of crude product. The material was recrystallized from CH3CN (a hot filtration was necessary to remove some undissolved solid) to give 11.0 g (47%) of desired product as a white crystalline solid:
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