742081-27-2Relevant academic research and scientific papers
Bismuth triflate-catalyzed addition of allylsilanes to N- alkoxycarbonylamino sulfones: Convenient access to 3-Cbz-protected cyclohexenylamines
Ollevier, Thierry,Li, Zhiya
supporting information; experimental part, p. 3251 - 3259 (2010/04/24)
Bismuth triflate was found to be an efficient catalyst in the Sakurai reaction of allyltrimethylsilanes with N-alkoxycarbonylamino sulfones. The reaction proceeded smoothly with a low catalyst loading of Bi(OTf) 3·4H2O (2-5 mol%) to afford the corresponding protected homoallylic amines in very good yields (up to 96%). A sequential allylation reaction followed by ring-closing metathesis delivers 6-8 membered 3-Cbz-protected cycloalkenylamines.
Unmodified nano-powder magnetite catalyzes a four-component aza-Sakurai reaction
Martinez, Ricardo,Ramon, Diego J.,Yus, Miguel
supporting information; experimental part, p. 1235 - 1240 (2009/05/30)
A new catalyst for an old material: magnetite is an excellent Lewis acid catalyst for the four-component aza-Sakurai reaction. The process could be repeated up to 15-times without losing effectiveness, with the catalyst recycling being as easy as the use of a simple magnet. The catalyst is selective and could discriminate between aldehyde and ketone functionalities, catalyzing first the reaction with the higher electrophilic aldehyde.
