References
- Schmidt , R. R. and Hoffmann , M. 1982 . Tetrahedron Lett. , 23 : 409
- Williams , R. M. and Stewart , A. O. 1983 . ibid. , 24 : 2715
- Cai , M. S. and Qiu , D. X. Bull. Chin. Chem. Soc. , in press.
- Austin , P. W. , Hardy , F. E. , Buchanan , J. G. and Badditey , J. 1964 . J. Chem. Soc. , : 2128 For the synthesis. [a]D 25 + 25.5 (acetone, c[dbnd]3.1); 1H-NMR (300 MHz, CDCl3): δ (ppm) 6.61 (d, 1H, J = 4.2 Hz, C1-H), 9.09 (s, 2H, C2[dbnd]-H, C6[dbnd]-H), 9.21 (s, 1H, C4[dbnd]-H).
- Hosomi , A. , Sakata , K. and Sakurai , H. 1984 . Tetrahedron Lett. , 25 : 2383 Giannis, A., Sandhoff, K., ibid., 1985, 26, 1479.
- Ogawa , Y. , Pernet , A. G. and Hanessian , S. 1973 . ibid. , : 3543