Acetic Acid → T 691

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2-Amino-1-(2-mercapto-2-methylpropylamino)benzene (5.59 g, 2.85×10-2 mol) and 2-(2-propynylthio)-2-methylpropanal 6.07 g, 4.28×10-2 mol, 150 M %) were mixed, then 125 ml methanol and 5.27 ml (5.7×10-2 mol, 200 M %) acetic acid were added and solids were allowed to dissolve. Sodium cyanoborohydride (5.39 g, 8.56×10-2 mol, 300 M %) was added to the reaction solution in three equal portions. The reaction was stirred at 21° C. for 17 hr, then quenched with 100 ml 0.5M HCl, stirred for 15 min, and then extracted with 2×150 ml ether. The ether layers were combined, washed with 60 ml saturated NaCl solution and dried over Na2SO4. The solvent was removed on the rotary evaporator and the residue was purified by filtration through flash silica in a 600 ml sintered glass funnel 3/4 full of silica, eluting with 500 ml portions of 2 × hexane and 2× 90% hexane/ether to produce 6.88 g (75% yield) 2-(2-mercapto-2-methyl-propylamino)-1-[2-(2-propynylthio)-2methylpropylamino]-benzene.

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