Bismuth Triflate-Catalyzed Addition of Allylsilanes to N-Alkoxycarbonylamino Sulfones: Convenient Access to 3-Cbz-Protected Cyclohexenylamines
作者:Thierry Ollevier、Zhiya Li
DOI:10.1002/adsc.200900710
日期:2009.12
Bismuth triflate was found to be an efficient catalyst in the Sakurai reaction of allyltrimethylsilanes with N-alkoxycarbonylaminosulfones. The reaction proceeded smoothly with a low catalyst loading of Bi(OTf)3⋅4 H2O (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
Highly diastereoselective synthesis of β-amino alcohols
作者:Wim J. N. Meester、Rudmer van Dijk、Jan H. van Maarseveen、Floris P. J. T. Rutjes、Pedro H. H. Hermkens、Henk Hiemstra
DOI:10.1039/b108254j
日期:2001.11.15
Several substituted β-amino alcohols 1 were synthesised in a diastereoselective manner via the novel highly versatile intermediate 8b, involving a combination of N-acyliminium ion and Weinreb amide chemistry.