1-methylsulfonyl-2,5-dihydropyrrole

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a shlenk tube was added trans-4-[(8-bromoquinazolin-2-yl)amino]cyclohexanol (322 mg, 1 mmol), followed by Pd(OAc)2 (48 mg, 0.2 mmol), (o-Tol)3P (60 mg, 0.2 mg), Ag2CO3 (192 mg, 0.7 mmol), toluene (8 mL) and iPr2NEt (516 mg, 4 mmol), followed by 1-(methylsulfonyl)-2,5-dihydro-1H-pyrrole (560 mg, 3.8 mmol). The mixture was refluxed overnight under Ar. TLC showed that several new spots were formed with small amount of starting material remaining. The reaction mixture was diluted with water (30 mL) and extracted with EtOAc (4×15 mL). The combined organic layers were washed with water, brine, dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by chromatography (eluting with DCM, then DCM/EA 3/1, then DCM/EA=2/1) to afford the title compound (88 mg, 23%) as an off white solid. 1H-NMR (CDCl3, 400 MHz): δ 8.97 (s, 1H), 7.59 (d, J=8.8 Hz, 1H), 7.55 (d, J=7.2 Hz, 1H), 7.21 (dd, J=8.8, 7.2 Hz, 1H), 6.60-6.58 (m, 1H), 5.51-5.49 (m, 1H), 5.22-5.19 (m, 1H), 5.16-5.11 (m, 1H), 4.36 (t, J=10.8 Hz, 1H), 3.99-3.94 (m, 1H), 3.58 (dd, J=10.8, 6.0 Hz, 1H), 2.85 (s, 3H), 2.30-2.24 (m, 2H), 2.12-2.08 (m, 2H), 1.41-1.26 (m, 4H). The mixture was refluxed overnight under Ar were formed with small amount of starting material extracted with EtOAc (4×15 mL) The combined organic layers were washed with water, brine dried over anhydrous Na2SO4 concentrated in vacuo The residue was purified by chromatography ( eluting with DCM