... 4; M. Hager, D. Liotta; J. Am. Chem. Soc., 113 (1991), p. 5117. ... b M. Shimixu, H. Yoshioka; Tetrahedron Lett., 29 (1988), p. 4101. .c M. Shimizu, H. Yoshioka; Tetrahedron Lett., 30 (1989), p. 967. d DP Cox, J. Terpinski, W. Lawrynowicz; J. Org. Chem., 49 (1984), p. 3216. ...