Lithium Hexamethyldisilazide → 3-(4-Bromo-2-chlorophenyl)-4-chloro-1-(cyclopropylsulfonyl)-1h-diimidazo[1,2-a:4',5'-d]pyridin-2(3h)-one

Participants

Reaction Steps

To a solution of the crude product (Step J) in 3 ml anhydrous THF was added LHMDS (0.4 ml, 0.4 mmol, 1M/THF) at 0° C. and the mixture was stirred for 5 min. The cyclopropyl sulfonamide (83 mg, 0.59 mol) was added neat and the mixture was warmed to room temperature and stirred for 15 h. The mixture was quenched with brine, diluted with H2O and extracted using a mixture of EtOAc/THF (3:1). The organic phase was washed with brine and dried with Na2SO4. Subsequent column chromatography (100% EtOAc) gave the title product as a brown oil (36 mg, 20% over the 2 last steps). Rf (100% EtOAc)=0.35. 1H-NMR (500 MHz, MeOH-D3): δ=8.80 (s, 1H), 7.89 (s, 1H), 7.86-7.85 (d, 1H), 7.68-7.66 (dd, 1H), 7.60-7.58 (d, 1H), 7.46 (s, 1H), 1.51-1.37 (m, 2H), 1.23-1.15 (m, 2H).

Provenance & Evidence