Highly Enantioselective Synthesis of (Diarylmethyl)amines by Rhodium-Catalyzed Arylation of N-Nosylimines Using a Chiral Bicyclo[3.3.0]diene Ligand
作者:Ming-Hua Xu、Guo-Qiang Lin、Li Wang、Zhi-Qian Wang
DOI:10.1055/s-0030-1258210
日期:2010.10
A highly efficient asymmetric arylation of N-nosylimines with arylboronic acids catalyzed by a rhodium-diene complex is described. A wide range of enantiopure (98-99% ee) N-(diarylmethyl)nosylamides, as well as (3S)-2-(4-nosyl)-3-phenylisoindolin-1-one, were obtained in high yields (83-99%) under very mild conditions. asymmetric catalysis - amines - arylations - rhodium - diarylmethylamines
Enantiopure imidazolinium-dithiocarboxylates as highly selective novel organocatalysts
作者:Oksana Sereda、Amélie Blanrue、René Wilhelm
DOI:10.1039/b817991c
日期:——
Asymmetric imidazolinium-dithiocarboxylates have been found for the first time to be highly selective catalysts; in the present case, the novel organocatalysts were able to catalyze the Staudinger reaction in up to 96% ee and 99% yield.
首次发现不对称咪唑啉鎓-二硫代羧酸盐是高选择性催化剂;在本例中,新型有机催化剂能够以高达 96% ee 和 99% 的产率催化施陶丁格反应。
Rhodium-Catalyzed Tandem Asymmetric Allylic Decarboxylative Addition and Cyclization of Vinylethylene Carbonates with N-Nosylimines
asymmetric allylic decarboxylative addition and cyclization of N-nosylimines with vinylethylene carbonates (VECs), in the presence of [Rh(C2H4)2Cl]2, chiral sulfoxide-N-olefin tridentate ligand has been developed. The reaction of VECs with various substituted N-nosylimines proceeded smoothly under mild conditions, providing highly functionalizedoxazolidine frameworks in good to high yields with good to
Formation of N-sulfonyl imines from iminoiodinanes by iodine-promoted, N-centered radical sulfonamidation of aldehydes
作者:Megan D. Hopkins、Kristina A. Scott、Brettany C. DeMier、Heather R. Morgan、Jesse A. Macgruder、Angus A. Lamar
DOI:10.1039/c7ob02120h
日期:——
A mild and operationally convenient formation of synthetically valuable N-sulfonyl iminesfrom a range of aryl aldehydes by reaction with iminoiodinanes (PhINZ) and I2 has been developed. According to mechanistic experiments described within, the reaction is speculated to proceed through an unconventional light-promoted, N-centered radical (NCR) pathway involving a N,N-diiodosulfonamide reactive species
作者:Sobia Tabassum、Oksana Sereda、Peddiahgari Vasu Govardhana Reddy、René Wilhelm
DOI:10.1039/b908899g
日期:——
KHMDS and KOtBu are well established as strong, hindered, non-nucleophilic Brønsted bases. However, in the present work these bases are applied as highly active Lewis base catalysts for the formal [2+2] cycloaddition of ketenes with aldehydes and imines.