Methyl iodide → 9-{[4-(Ethyloxy)phenyl]sulfonyl}-2,10a-dimethyl-8,9,10,10a-tetrahydropyrido[2',3':3,4]pyrrolo[1,2-a]pyrazin-5(7H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 9-{[4-(ethyloxy)phenyl]sulfonyl}-2-methyl-8,9,10,10a-tetrahydropyrido[2′,3′:3,4]pyrrolo[1,2-a]pyrazin-5(7H)-one (31 mg) in dry THF (0.5 mL) under argon at −78° C. was added LiHMDS (0.104 mL, 1M, in THF) dropwise. The reaction was stirred at −78° C. for 30 minutes and then the temperature of the cool bath raised to −50° C. over 15 minutes. A solution of methyl iodide (75 μL) in dry THF (1 mL) was made and then 100 μL of this solution added to the reaction dropwise. The reaction was then allowed to warm to −10° C. naturally in the cool bath and then the cool bath removed and the reaction stirred for 20 minutes. LCMS showed good conversion to product. The reaction mixture was concentrated in vacuo and then the mixture taken up in 1:1 MeOH:DMSO and this mixture filtered before purification by MDAP to give the title compound (14 mg) as white solid.

Provenance & Evidence