References
- Evans , D. A. , Crawford , T. C. , Fujimoto , T. T. and Thomas , R. C. 1974 . J. Org. Chem. , 39 : 3176
- Gill , M. , Bainton , H. P. and Rickards , R. W. 1981 . Tetrahedron Lett. , 1437
- Toru , T. , Kurozumi , S. , Tanaka , T. , Miura , S. , Kobayashi , M. and Ishimoto , S. 1974 . Synthesis , 867
- Branca , S. J. and Smith , A. B. III . 1978 . J. Am. Chem. Soc. , 100 : 7767 M. A. Guaciaro, P. M. Wovkulich, and A. B. Smith, III, Tetrahedron Lett., 4661 (1978)
- Ratclife , R. and Rodehorst , R. 1970 . J. Org. Chem. , 35 : 4000
- Reich , H. J. , Renga , J. M. and Reich , I. L. 1975 . J. Am. Chem. Soc. , 97 : 5434 Chemical shifts and multiplicities of a vinyl proton in compounds 8 and 9, are as follows: 8 — 8.29 ppm, t, J=2.6 Hz) 9 — 6.72 ppm, t, J=1.5 Hz (K. Mori, Tetrahedron, 34, 915 (1978) For compound obtained by oxidation of 7b values: 8.25 ppm, t, J=2.7 Hz were obtained, which indicates the structure 8 to be proper.
- Alder , K. and Flock , F. W. 1956 . Chem. Ber. , 89 : 1732
- Czernecki , S. , Georgoulis , C. and Provelenghiou , C. 1976 . Tetrahedron Lett. , 3535
- Corey , E. J. and Venkateswarlu , A. 1972 . J. Am. Chem. Soc. , 94 : 6190