Tetrahedron letters

Convenient syntheses of tonghaosu and two thiophene substituted spiroketal enol ether natural products

Y Gao, WL Wu, B Ye, R Zhou, YL Wu

Index: Gao, Yang; Wu, Wen-Lian; Ye, Bin; Zhou, Rong; Wu, Yu-Lin Tetrahedron Letters, 1996 , vol. 37, # 6 p. 893 - 896

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Citation Number: 41

Abstract

(relative intensity): 220 (M+, 100), 203 (2.9), 189 (36), 178 (20), 150 (11), 136 (30); Anal.Calc. for C 12 H 12 O 2 S: C, 65.43; H, 5.49; S, 14.56; Found: C, 65.77; H, 5.43; S, 14.33. Compound 3: Oil; ν max (film, cm −1 ): 3098, 2945, 2877, 1649, 1582, 1468, 1244; δ H (600MHz, C 6 D 6 ): 7.27 (1H, d, J=3.4Hz), 7.22 (1H, d, J=5.1Hz), 7.05 (1H, dd, J=3.4Hz, 5.1Hz), 6.08 (1H, d, J=5.6Hz), 6.02 (1H, d, J=5.6 Hz), 5.82 (1H, s), 4.47 (1H, m), 3.91 (1H, ...