Methanesulfonyl chloride → HCID 76540325, compound

Participants

Reaction Steps

A solution of 2-[2,4-dioxo-3-(hydroxymethylene)-5-phenyl-2,3,4,5-tetrahydro-1H-1,5-diazepin-1-yl]-N-isopropyl-N-(4-methoxyphenyl)acetamide (−12r, 0.500 g) in CH2Cl2 (10 mL) under argon was treated with methanesulfonyl chloride (0.266 mL) and diisopropylethylamine (0.598 mL). After several minutes, the reaction was transferred to a separatory funnel and washed with aqueous 1N NaHSO4. The aqueous layer was back-extracted with CH2Cl2. The combined organic layers were dried over anhydrous MgSO4, filtered and evaporated in vacuo. The residue was purified on flash grade silica gel eluting with 2:3 ethyl acetate/hexane. Fractions containing the product were combined, evaporated in vacuo and triturated with hexane. Hexane was removed in vacuo and the residual solid was dried under high vacuum to provide 2-[2,4-dioxo-3-(methanesulfonyloxymethylene)-5-phenyl-2,3,4,5-tetrahydro-1H-1,5-diazepin-1-yl]-N-isopropyl-N-(4-methoxyphenyl)acetamide (12s, 0.502 g) as a solid. The product was contaminated with approximately 40% of 2-[2,4-dioxo-3-methylene-5-phenyl-2,3,4,5-tetrahydro-1H-1,5-diazepin-1-yl]-N-isopropyl-N-(4-methoxyphenyl)acetamide which reacted equally well in the subsequent steps. 1H NMR (300 MHz, CDCl3) 1.10 (d, J=7 Hz, 6H), 3.15 (s, 3H), 3.89 (s, 3H), 3.96 (d, J=2 Hz, 2H), 4.92 (m, 4H), 6.03 (m, 2H), 7.00 (m, 2H), 7.18 (m, 2H), 7.40 (m, 5H).

Provenance & Evidence