反应详情

Compound 20 was prepared from Compound 13 using the same procedure as described above for Compound 16. Yield 1.29 g (72.9%) as a viscous oil. Rf=0.28 (hexane:diethyl ether 6:4); 1H NMR δ 6.44 (d, J=2.1 Hz, 2H), 6.20 (t, J=2.1 Hz, 1H), 5.70 (br s, 2H), 2.02–1.98 (m, 1H), 1.57–1.35 (m, 6H), 1.18 (s, 6H); 13C NMR δ 156.22, 154.66, 105.10, 99.83, 53.24, 50.33, 36.21, 24.99, 24.75; MS: (ESI, Neg.) m/z 219 ([M−H]−).