References
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- Gupton , J. and Polk , D. 1981 . Synth. Commun. , 11 : 571
- Gupton , J. , Andrew , S. and Colon , C. 1982 . ibid. , 12 : 35
- Gupton , J. , Lizzi , M. and Polk , D. 1982 . ibid , 12 : 939
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- Jutz , C. , Wagner , R. and Lobering , H. 1974 . ibid , 86 : 781
- 1983 . Aldrich Handbook of Fine Chemicals , 675 Milwaukee, WI : Aldrich Chemical Co. .
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- Katritzky , A. 1963 . Physical Methods in Heterocyclic Chemistry , Vol. II , 270 New York, NY : Academic Press .
- We thank Professor James A. Marshall of the University of South Carolina for suggesting Scheme 5 as an alternative pathway
- Katritzky , A. and Boulton , A. 1979 . Advances in Heterocyclic Chemistry , Vol. 24 , 1 – 61 . New York, NY : Academic Press .
- Errede , L. , Oien , H. and Yarian , O. 1977 . J. Org. Chem. , 42 : 12
- Infrared spectra were recorded on either a Perkin-Elmer Model 1420 infrared spectrometer or a Nicolet MXS FT IR as thin films or nujol mulls. NMR spectra were obtained in CC14, DCCl3, or Me2SO - d6 solutions [(CH3)4 Si internal standard)] at 60 MHz with a Varian EM-360 spectrometer. When NMR samples were run in D2O-DC1 mixtures, DSS was the internal standard. Some of the mass spectra were obtained on a Hitachi Perkin-Elmer RMU-6E spectrometer. All boiling points and melting points are uncorrected and melting points were recorded on a Fisher-Johns melting-point apparatus.