反应详情

14-tert-Butoxycarbonylamino-18-(tert-butyl-dimethyl-silanyloxy)-2,15-dioxo-3,16-diaza-tricyclo[14.3.0.04,6]nonadec-7-ene-4-carboxylic acid (500 mg, 0.86 mmol.) was dissolved in 25 mL of THF and treated with CDI (180 mg, 1.12 mmol.). (Care was taken to avoid moisture by using oven dried glassware and maintaining a dry N2 atmosphere). After refluxing the reaction mixture for 2 h, it was cooled to rt and treated sequentially with cyclopropylsulfonamide (135 mg, 1.12 mmol.) and DBU (170 mg, 1.12 mmol.). The reaction mixture was stirred for 4 h at rt, and the THF was removed by rotary evaporation. The residue was partitioned between ethyl acetate and pH 4 buffer. The organic phase was dried (MgSO4) and concentrated in vacuo to give the crude product. It was then purified by flash chromatography (eluting with 33% ethyl acetate in hexane) to give 300 mg (51%) of [18-(tert-butyl-dimethyl-silanyloxy)-4-cyclopropanesulfonylaminocarbonyl-2,15-dioxo-3,16-diaza-tricyclo[14.3.0.04,6]nonadec-7-en-14-yl]-carbamic acid tert-butyl ester as a white solid. 1H NMR (300 MHz, CD3OD) δ 1H 0.07 (s, 3H), 0.08 (s, 3H), 0.85 (s, 9H), 0.87-1.49 (m, 21H), 1.73-1.95 (m, 3H), 2.08-2.16 (m, 1H), 2.25-2.36 (m, 2H), 2.42-2.56 (m, 1H), 2.85-2.93 (m, 1H), 3.65-3.74 (dd, J=10.61, 3.66 Hz, 1H), 3.89 (d, J=10.25 Hz, 1H), 4.34 (m, J=9.70, 9.70 Hz, 1H), 4.43 (t, J=7.87 Hz, 1H), 4.57 (s, 1H), 4.94-5.01 (m, 1H), 5.10 (d, J=8.78 Hz, 1H), 5.66-5.75 (m, 1H), 6.55 (s, 1H), 10.13 (s, 1H); MS m/z 683 (M++1).

1. customdried glassware
2. temperaturemaintaining a dry N2 atmosphere)
3. temperatureAfter refluxing the reaction mixture for 2 h
4. customthe THF was removed by rotary evaporation
5. customThe residue was partitioned between ethyl acetate and pH 4 buffer
6. dry with materialThe organic phase was dried (MgSO4)
7. concentrationconcentrated in vacuo
8. customto give the crude product
9. customIt was then purified by flash chromatography (eluting with 33% ethyl acetate in hexane)