Cesium carbonate → tert-butyl 6'-(3-cyclopropyl-4-((R)-1-((R)-5-oxopyrrolidin-3-yl)ethoxy)-3H-imidazo[4,5-c]pyridin-6-yl)-1'-methyl-2'-oxospiro[azetidine-3,3'-indoline]-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

In a 5 mL microwave vial, a mixture of (R)-4-((R)-1-((6-chloro-3-cyclopropyl-3H-imidazo[4,5-c]pyridin-4-yl)oxy)ethyl)pyrrolidin-2-one and (R)-4-((R)-1-((6-bromo-3-cyclopropyl-3H-imidazo[4,5-c]pyridin-4-yl)oxy)ethyl)pyrrolidin-2-one 2.71 (50 mg, 0.14 mmol), tert-butyl 1′-methyl-2′-oxo-6′-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)spiro[azetidine-3,3′-indoline]-1-carboxylate 7.59 (68 mg, 0.16 mmol), cesium carbonate (140 mg, 0.43 mmol), and PEPPSI-IPr catalyst (8.2 mg, 0.01 mmol) were taken up in dimethoxyethane (1.8 mL) and water (0.9 mL). After evacuating and backfilling with argon, mixture was heated at 100° C. for 90 minutes in a microwave reactor. After cooling to rt, reaction mixture was poured into water and extracted with ethyl acetate. Combined organics were dried (Na2SO4), filtered, and concentrated under reduced pressure. The resulting residue was purified via silica gel column chromatography (0-10% methanol/dichloromethane) to yield tert-butyl 6′-(3-cyclopropyl-4-((R)-1-((R)-5-oxopyrrolidin-3-yl)ethoxy)-3H-imidazo[4,5-c]pyridin-6-yl)-1′-methyl-2′-oxospiro[azetidine-3,3′-indoline]-1-carboxylate 3.84 (53 mg). LCMS-ESI+ (m/z): [M+H]+ calcd for C31H37N6O5: 573.27; found: 573.27.

Provenance & Evidence