Water → (R)-methyl 2-(4-chloro-5-(methoxycarbonyl)pyrimidin-2-yl)-1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate

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Reaction Steps

A solution of methyl 2,4-dichloropyrimidine-5-carboxylate (27 mg, 0.13 mmol) in dichloroethane/t-butanol (1:1, 2 mL) was cooled to 0° C. ZnCl2 solution (1.0 M in ether, 0.29 mL, 0.29 mmol, 2.2 eq.) was added. After stirring for 1 h, a solution of (R)-methyl 1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate (30 mg, 0.09 mmol) in dichloroethane/t-butanol (1:1, 2 mL) was added slowly at 0° C. The mixture was stirred at rt overnight. Water (10 mL) was added and the mixture was extracted with EtOAc (10 mL×3). The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated under vacuum. The residue was purified by preparative TLC to afford (R)-methyl 2-(4-chloro-5-(methoxycarbonyl)pyrimidin-2-yl)-1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate (34 mg, 77.3% yield) as a solid.

Provenance & Evidence