反应详情

温度

90 °C

Prepared using General Procedure 2. To a stirring solution of 3-cyano-4-isopropoxybenzoic acid (16.7 mg, 0.08 mmol) in DMF (1 mL) were added HOBt (14.3 mg, 0.11 mmol) and EDCI (20.3 mg, 0.11 mmol). After stirring for 30 min, (R)-N,5-dihydroxy-5,6,7,8-tetrahydronaphthalene-1-carboximidamide INT-4 (27.3 mg, 0.09 mmol) was added as a solution in DMF (1.5 mL). After stirring at room temperature for an additional 60 min, the mixture was heated to 90° C. for 15 h. The mixture was diluted with EA and washed with NaHCO3. The combined organic layers were dried, concentrated, chromatographed (EA/hexanes) to provide 12.72 mg (42.4%) (R)-5-(3-(5-hydroxy-5,6,7,8-tetrahydronaphthalen-1-yl)-1,2,4-oxadiazol-5-yl)-2-isopropoxybenzonitrile 1 as a white solid. LCMS-ESI (m/z) calculated for C22H21N3O3: 375.4; found 376.1 [M+H]+, tR=3.73 min. 1H NMR (400 MHz, CDCl3) δ 8.42 (d, J=2.2 Hz, 1H), 8.33 (dd, J=8.9, 2.2 Hz, 1H), 7.97 (dd, J=7.7, 1.3 Hz, 1H), 7.66 (d, J=7.2 Hz, 1H), 7.38 (t, J=7.7 Hz, 1H), 7.12 (d, J=9.0 Hz, 1H), 4.91-4.83 (m, 1H), 4.79 (dq, J=12.0, 6.0 Hz, 1H), 3.20 (dt, J=17.8, 5.4 Hz, 1H), 3.01 (dt, J=13.3, 6.4 Hz, 1H), 2.13-1.81 (m, 4H), 1.79 (d, J=7.2 Hz, 1H), 1.47 (d, J=5.6 Hz, 6H). 13C NMR (101 MHz, CDCl3) δ 172.70, 169.48, 162.75, 140.10, 137.4, 134.13, 133.88, 131.68, 129.96, 126.18, 125.97, 116.82, 115.26, 113.54, 103.95, 72.73, 68.47, 31.62, 28.50, 21.73, 18.57. Chiral HPLC: (R)-5-(3-(5-hydroxy-5,6,7,8-tetrahydronaphthalen-1-yl)-1,2,4-oxadiazol-5-yl)-2-isopropoxybenzonitrile was eluted with 10% IPA/hexane: 99.4% ee, tR=40.85 min.

1. customPrepared
2. stirringAfter stirring at room temperature for an additional 60 min
3. washwashed with NaHCO3
4. customThe combined organic layers were dried
5. concentrationconcentrated
6. customchromatographed (EA/hexanes)