Fringuelli, Francesco; Pizzo, Ferdinando; Taticchi, Aldo; Halls, Timothy D. J.; Wenkert, Ernest
Journal of Organic Chemistry, 1982 , vol. 47, # 26 p. 5056 - 5065

Fujiwara, Tooru; Tomaru, Jun-ichiro; Suda, Atsushi; Takeda, Takeshi
Tetrahedron Letters, 1992 , vol. 33, # 18 p. 2583 - 2586