Lithium methanolate → 4-[3E-(2,4-Dimethoxy-5-pyrrolidin-1-yl-phenyl)-acryloyl]-N-pyridin-2-yl-benzenesulfonamide

Participants

Reaction Steps

A solution 4-acetyl-N-pyridin-2-ylbenzenesulfonamide (Ex-5A, 588 mg, 2.13 mmol) and 2,4-dimethoxy-5-pyrrolidin-1-yl-benzaldehyde (Ex-38B, 500 mg, 2.13 mmol) in DMF (9.3 mL) and MeOH (4.0 mL) was treated with lithium methoxide (243 mg, 6.39 mmol) and stirred for 20 h at room temperature under nitrogen. The reaction mixture was quenched with water (25 mL) and extracted ethyl acetate (3×50 mL). The product precipitated out of the organic phase to give 535 mg (51%) of the title compound as a red solid, mp 124–128° C. 1H-NMR (300 MHz, DMSO-d6) 8.16 (d, 2H, J=8.7), 8.02 (d, 1H, J=15.9 Hz), 7.95 (m, 3H), 7.70 (t, 1H, J=7.80 Hz), 7.61 (d, 1H, J=16.2 Hz), 7.18 (d, 1H, J=8.70 Hz), 7.15 (s, 1H), 6.83 (t, 1H, J=6.0 Hz), 6.66 (s, 1H), 3.84 (s, 6H), 3.13 (m, 4H), 1.18 (m, 4H). HRMS (ESI) Calcd. for C26H27N3O5S: 494.1750 [(M+H)+]; Found: 494.1750.

Provenance & Evidence