Tributylvinyltin → N-(4-methoxybenzyl)-N-(thiazol-2-yl)-4-(2-vinylphenyl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonamide

Participants

Reaction Steps

A mixture of 4-(2-bromophenyl)-N-(4-methoxybenzyl)-N-(thiazol-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonamide (1.2 g, 2.626 mmol), tributyl(vinyl)stannane (3.0 g, 10.5 mmol, Finar), Pd(PPh3)4 (303 mg, 0.131 mmol) in DMF (15 mL) was degassed with nitrogen for 10 minutes. The reaction mixture was subjected to microwave irradiation for 2 h at 100° C. After completion, the reaction mixture was diluted with water (10 mL) and extracted with ethyl acetate (3×15 mL). The organic layer was dried over sodium sulfate and concentrated under reduced pressure to obtain crude material which was purified by combi flash column chromatography (column size: 12 g; elution: 0-5% ethyl acetate in hexane) to get N-(4-methoxybenzyl)-N-(thiazol-2-yl)-4-(2-vinylphenyl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonamide (750 mg, 68.0%) as a yellow solid. m/z (ESI) 520.1 (M+H)+.

Provenance & Evidence