Tetrahedron letters

A new and convenient synthesis of protoberberine alkaloids:(±)-tetrahydropalmatine,(±)-sinactine,(±)-canadine, and (+)-stylopine

S Yasuda, T Hirasawa, M Hanaoka

Index: Yasuda, Shingo; Hirasawa, Taeko; Hanaoka, Miyoji Tetrahedron Letters, 1987 , vol. 28, # 21 p. 2399 - 2402

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Citation Number: 12

Abstract

1 H-NMR spectral data of the products: 12a; δ 7.00, 6.70 (each 1H, s), 6.98, 6.86 (2H, AB-q, J=8.5), 4.54, 4.40 (2H, AB-q, J=16.5), 4.36 (1H, s), 3.86, 3.83, 3.79, 3.68 (each 3H, s), 2.21 (3H, s). 12b; δ 7.02, 6.52 (each 1H, s), 6.73 (2H, s), 5.95 (2H, s), 4.48, 3.83 (2H, AB-q, J=16), 4.39 (1H, s), 3.85, 3.50 (each 3H, s), 2.22 (3H, s). 12C; δ 6.99, 6.78 (2H, AB-q, J=8.5), 6.99, 6.72 (each 1H, s), 5.91 (2H, s), 4.55, 4.42 (2H, AB-q, J=16), 4.36 (1H ...

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