Davies, Stephen G.; Doisneau, Gilles J. -M.; Prodger, Jeremy C.; Sanganee, Hitesh J.
Tetrahedron Letters, 1994 , vol. 35, # 15 p. 2369 - 2372

Fukuzawa, Shin-Ichi; Hongo, Yuki
Tetrahedron Letters, 1998 , vol. 39, # 21 p. 3521 - 3524