Silver-Catalyzed Enantioselective Propargylation Reactions of <i>N</i>-Sulfonylketimines
作者:Charlotte A. Osborne、Thomas B. D. Endean、Elizabeth R. Jarvo
DOI:10.1021/acs.orglett.5b02692
日期:2015.11.6
The enantioselective silver-catalyzed propargylation of N-sulfonylketimines is described. This reaction proceeds in high yield and excellent enantiomeric ratio and is compatible with a wide variety of diaryl- and alkylketimines. Synthetic transformations of homopropargylic products via enyne ring-closing metathesis, Sonogashira cross-coupling, and reduction reactions proceed with high stereochemical
Asymmetricaddition of arylboroxines to cyclic N-sulfonyl ketimines proceeded in the presence of a rhodium catalyst coordinated with a chiral diene ligand to give high yields of benzosultams, where a triaryl-substituted stereogenic carbon center was created with high enantioselectivity (93-99% ee). The chiral benzosultams were transformed into the chiral (triaryl)methylamines by breaking the cyclic
在与手性二烯配体配位的铑催化剂存在下,芳基环硼氧烷与环状 N-磺酰基酮亚胺的不对称加成得到高产率的苯并磺胺,其中三芳基取代的立体碳中心以高对映选择性(93-99% ee )。通过破坏环状结构,手性苯并磺胺转化为手性(三芳基)甲胺。
Simple Branched Sulfur–Olefins as Chiral Ligands for Rh-Catalyzed Asymmetric Arylation of Cyclic Ketimines: Highly Enantioselective Construction of Tetrasubstituted Carbon Stereocenters
作者:Hui Wang、Tao Jiang、Ming-Hua Xu
DOI:10.1021/ja3110818
日期:2013.1.23
New, simple, sulfinamide-based branched olefin ligands have been developed and successfully used in Rh-catalyzed asymmetric arylations of cyclic ketimines, providing efficient and highly enantioselective access to valuable benzosultams and benzosulfamidates containing a stereogenic quaternary carbon center. This is the first example of applying a sulfur-olefin ligand in catalytic asymmetric addition
Iridium-catalyzed direct C–H arylation of cyclic <i>N</i>-sulfonyl ketimines with arylsiloxanes at ambient temperature
作者:Writhabrata Sarkar、Arup Bhowmik、Sumit Das、Aiswarya Balaram Sulekha、Aniket Mishra、Indubhusan Deb
DOI:10.1039/d0ob01212b
日期:——
A highly efficient iridium-catalyzed ortho-selective C–H arylation of weakly coordinating cyclic N-sulfonyl ketimines has been achieved with environmentally benign aryl siloxanes at ambient temperature giving access to a novel class of biaryls.
Enantioselective organocatalytic oxidation of ketimine
作者:Shinobu Takizawa、Kenta Kishi、Mohamed Ahmed Abozeid、Kenichi Murai、Hiromichi Fujioka、Hiroaki Sasai
DOI:10.1039/c5ob02042e
日期:——
with promoted the enantioselective organocatalytic oxidation of to afford oxaziridines bearing a tetrasubstituted carbon stereogenic center in high yields with up to 87% ee.