反应详情

To a solution of 1-{[1-(2-tert-butoxycarbonylamino-non-8-enoyl)-4-(tert-butyl-dimethyl-silanyloxy)-pyrrolidine-2-carbonyl]-amino}-2-vinyl-cyclopropanecarboxylic acid ethyl ester (1.63 g, 2.56 mmoL) in 640 mL of methylene chloride was added 215 mg (0.26 mmoL) of tricyclohexylphosphine[1,3-bis(2,4,6-tri[benzylidene]ruthenium(IV)dichloride. The mixture was heated at reflux for 15 min. The residue was concentrated in vacuo, and then purified by flash chromatography eluting with 30% ethyl acetate/hexane. To further decolorize the sample, the crude product was chromatographed a second time eluting with 50% ether in hexane to give 1.5 g (96%) of 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 ethyl ester as a white solid. 1H NMR (500 MHz, CD3Cl) δ 0.06 (s, 3H), 0.07 (s, 3H), 0.86 (s, 9H), 1.18–1.24 (m, 6H), 1.34–1.64 (m, 14H), 1.86–1.96 (m, 3H), 2.02–2.09 (m, 1H), 2.11–2.17 (m, 1H), 2.19–2.28 (m, 1H), 2.57–2.63 (m, 1H), 3.50–3.54 (m, 1H), 3.71 (dd, J=10.22, 6.26 Hz, 1H), 4.06–4.17 (m, 2H), 4.52–4.58 (m, 2H), 4.75 (d, J=8.55 Hz, 1H), 5.21 (t, J=9.92 Hz, 1H), 5.35 (d, J=7.63 Hz, 1H), 5.45–5.50 (m, 1H), 6.94 (s, 1H). LC-MS (Method A, retention time: 3.88 min), MS m/z 608 (M++1).

1. temperatureThe mixture was heated
2. temperatureat reflux for 15 min
3. concentrationThe residue was concentrated in vacuo
4. custompurified by flash chromatography
5. washeluting with 30% ethyl acetate/hexane
6. customthe crude product was chromatographed a second time
7. washeluting with 50% ether in hexane