Triphenylphosphine → tert-butyl 4-(4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-1-piperidinecarboxylate

Participants

Reaction Steps

At −10° C. and under N2 atmosphere, to a stirred solution of 4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidine (3.0 g, 10.7 mmol), tert-butyl 4-hydroxypiperidine-1-carboxylate (5.4 g, 26.8 mmol), and PPh3 in anhydrous THF were slowly added DIAD over one hour. The resulting reaction mixture was subsequently warmed up to room temperature and stirred for additional 2 hours. Once the yellow precipitation was generated, the reaction mixture was cooled back to −5° C. and stirred overnight. While the solution was still cold, the yellow precipitation was quickly filtrated and washed with cold THF (30 mL) to afford tert-Butyl 4-(4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidin-7-yl)piperidine-1-carboxylate (62) (1.77 g, 36%) as a white solid. LC-MS (ESI): m/z (M/M+2) 463.1/465.1.

Provenance & Evidence