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

Participants

Reaction Steps

A solution 4-acetyl-N-pyridin-2-ylmethyl-benzenesulfonamide (Ex-53A, 617 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 (162 mg, 4.26 mmol) and stirred for 20 h at room temperature under nitrogen. The reaction mixture was quenched with water (20 mL) and extracted ethyl acetate (3×50 mL). The organic phase was brined, dried over sodium sulfate, and concentrated to a red solid. Crystallization from hot ethanol (25 mL) and water (50 mL) gave the title compound as a red solid (626 mg, 58%), mp 112–116° C. 1H-NMR (300 MHz, DMSO-d6) 8.40 (m, 3H), 8.19 (d, 2H, J=9.0 Hz), 8.05 (d, 1H, J=15.9 Hz), 7.89 (d, 2H, J=9.0 Hz), 7.62 (m, 2H), 7.25 (dd, 1H, J=4.5, 5.7 Hz), 7.17 (s, 1H), 6.67 (s, 1H), 4.05 (d, 2H, J=5.7 Hz), 3.86 (s, 3H), 3.85 (s, 3H), 3.16 (br s, 4H), 1.82 (br s, 4H). HRMS (ESI) Calcd. for C27H29N3O5S: 508.1906 [(M+H)+]; Found: 508.1902.

Provenance & Evidence