2-Bromo-4-(trifluoromethyl)benzenesulfonyl chloride → 9-{[2-Bromo-4-(trifluoromethyl)phenyl]sulfonyl}-2-methyl-8,9,10,10a-tetrahydropyrido[2',3':3,4]pyrrolo[1,2-a]pyrazin-5(7H)-one

Participants

Reaction Steps

To the solution of 2-methyl-8,9,10,10a-tetrahydropyrido[2′,3′:3,4]pyrrolo[1,2-a]pyrazin-5(7H)-one (may be prepared as described in Intermediate 8; 100 mg) in dichloromethane (3.5 ml), DIPEA (0.129 ml) was added under argon atmosphere at room temperature then 2-bromo-4-(trifluoromethyl)benzenesulfonyl chloride (159 mg) was added at 0° C., and then the ice water bath was removed and the reaction mixture allowed to stir at room temperature for 3 h. The reaction mixture was partitioned between DCM (40 ml) and (20 ml) sodium bicarbonate. The organic phase was washed with sodium bicarbonate (20 ml), HCl (2×20 ml) and water (2×20 ml) and then it was dried using phase separator before the DCM was removed under vacuum to give the title compound (170 mg), which was used in next step without purification.

Provenance & Evidence