Trifluoroacetic acid → HCID 59398030, compound

Participants

Reaction Steps

To 20 mL of a chloroform solution containing 0.23 g of tert-butyl (7-chloro-4-methyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-ylmethyl)(1-(2-(7-methoxy-2-oxoquinoxalin-1(2H)-yl)ethyl)piperidin-4-yl)carbamate, 20 mL of trifluoroacetic acid was added and stirred at room temperature for 12 hours. After solvents of the reaction mixture were removed under reduced pressure and the residue was alkalized by aqueous saturated sodium hydrogen carbonate solution, it was extracted with chloroform. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue thus obtained was purified by silica gel column chromatography [Silica Gel; Kanto Chemical Co., Inc., Silica Gel 60N, eluent; chloroform:methanol=10:1], to give 0.16 g of 1-(2-(4-((7-chloro-4-methyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one as a pale brown foam.

Provenance & Evidence