41043-90-7Relevant articles and documents
Sn(OTf)2 as an effective lewis acid in reactions of cyclopropyl ketones with acetic anhydride: Application in the synthesis of a 19-Nor-B-homo steroid
Kranz, Darius Paul,Meier Zu Greffen, Aike,El Sheikh, Sherif,Neudoerfl, Joerg Martin,Schmalz, Hans-Guenther
, p. 2860 - 2866 (2011)
Attempts to convert 3β-acetoxy-5,19-cyclo-pregna-6,20-dione (8) into a cyclocitrinol-related steroid with a bicyclo[4.4.1]-undecane AB-ring substructure through a Lewis acid-assisted fragmentation failed. Instead, treating 8 with an excess of Ac2/su