... Tetrahedron. Volume 50, Issue 41, 1994, Pages 11945–11966. ... Tetrahedron Lett., 28 (1987), pp. 4143–4146. ... Commun., 19 (1982), pp. 989–993 gave an unusually sluggish reaction and, by forcing the reaction conditions, that is working at 50°C, side reactions took place. ...