Cesium carbonate → Tert-butyl 1-(7-(5,6-dimethoxypyridin-2-ylamino)thiazolo[5,4-d]pyrimidin-5-yl)pyrrolidin-3-ylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 5-chloro-N-(5,6-dimethoxypyridin-2-yl)thiazolo[5,4-d]pyrimidin-7-amine (344 mg, 1.06 mmol), tert-butyl pyrrolidin-3-ylcarbamate (289 mg, 1.55 mmol), X-Phos (256 mg, 0.53 mmol) and Cs2CO3 (1.3 g, 3.9 mmol) in 120 mL of dioxane at room temperature under nitrogen was added Pd2(dba)3 (138 mg, 0.24 mmol) in one portion. Then the reaction was stirred at 95° C. under nitrogen for 24 hours. The solvent was evaporated and the residue was purified by silica gel chromatography (silica gel 200-300 mesh, eluting with a mixture of ethyl acetate and petroleum ether (2:1)) to give tert-butyl 1-(7-(5,6-dimethoxypyridin-2-ylamino)thiazolo[5,4-d]pyrimidin-5-yl)pyrrolidin-3-ylcarbamate (260 mg, 51.7%) as an oil. LC-MS: 474.2 [M+H]+, tR=1.67 min.

Provenance & Evidence