[CH3:1][N:2]([CH3:21])[CH2:3][CH2:4][NH:5][C:6]1[C:19]2[C:18](=[O:20])[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[S:11][C:10]=2[CH:9]=[CH:8][CH:7]=1.[CH2:22]=[O:23].[OH-].[Na+]>C(O)(=O)C>[CH:6]([NH2:5])([CH3:19])[CH3:7].[CH3:1][N:2]([CH3:21])[CH2:3][CH2:4][NH:5][C:6]1[C:19]2[C:18](=[O:20])[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[S:11][C:10]=2[C:9]([CH2:22][OH:23])=[CH:8][CH:7]=1A mixture of 1-[[2-(dimethylamino)ethyl]amino]thioxanthen-9-one (13 g, 0.044 mol) , 37% formalin (390 mL) and 5N acetic acid (6.5 mL) was heated to 100° C. for 8.5 hours, allowed to stand over the weekend and then was heated at 100° C. for several more hours. The mixture was poured into ice water, basified with 35% NaOH and extracted with chloroform. The organic layer was washed with brine, dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica eluting in succession with; 25% CHCL3 /hexane; 50% CHCl3 /hexane; 75% CHCl3 /hexane; 100% CHCl3 ; 0.5% isopropylamine/chloroform; 1% isopropylamine/chloroform; 2% isopropylamine/chloroform; then 2% isopropylamine/2% MeOH/CHCl3 to afford 9.2 g (64%) of 1-[[2-(dimethylamino) ethyl]amino]-4-(hydroxymethyl)thioxanthen-9-one.
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