... b M. Yamaguchi, K. Hasebe, T. Minami; Tetrahedron Lett., 27 (1986), p. 2401. 2; S. Mahalingam, PC Kuzuma, JY-C. Lee, TM Harris; Independently, Harris et al reported a similar approach to 6-methylpretetramide J. Am. Chem. Soc., 107 (1985), p. 7760. ...
[Harris, Thomas M.; Harris, Constance M.; Oster, Timothy A.; Brown, Larry E.; Lee, John Y.-C. Journal of the American Chemical Society, 1988 , vol. 110, # 18 p. 6180 - 6186]