[CH:1]1([OH:6])[CH2:5][CH:4]=[CH:3][CH2:2]1.O[N:8]1[C:16](=[O:17])[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C:9]1=[O:18].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C.N#N>C(Cl)Cl.O>[CH:1]1([O:6][N:8]2[C:16](=[O:17])[C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[C:9]2=[O:18])[CH2:5][CH:4]=[CH:3][CH2:2]1To a solution of cyclopent-3-enol (840 mg, 10.0 mmol) in CH2Cl2 (25.0 mL) was added 2-hydroxyisoindoline-1,3-dione (1.96 g, 12.0 mmol) and triphenylphosphine (3.93 g, 15.0 mmol). The resultant mixture was cooled to 0° C. and diisopropylazodicarboxylate (2.95 ml, 15.0 mmol) was slowly added drop wise under N2 atmosphere. The reaction mixture was stirred at ambient temperature for 48 h. To the reaction mixture, H2O (100 mL) was added and extracted with CH2Cl2. The organic layers washed with brine. Dried over anhydrous Na2SO4, filtered and concentrated to provide yellow oil, which was purified by flash chromatography (50% EtOAc-hexane) to yield 2-(cyclopent-3-enyloxy)isoindoline-1,3-dione (740 mg, 32%) as light yellow oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.57-2.87 (m, 4H) 5.12 (t, J=6.19 Hz, 1H) 5.75 (s, 2H) 7.74 (dd, J=5.68, 3.16 Hz, 2H) 7.79-7.87 (m, 2H). MS (ES) [M+H] calculated for C13H12NO3, 230.07; found 230.20.
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