Expanding the Utility of Brønsted Base Catalysis: Biomimetic Enantioselective Decarboxylative Reactions
作者:Yuanhang Pan、Choon Wee Kee、Zhiyong Jiang、Ting Ma、Yujun Zhao、Yuanyong Yang、Hansong Xue、Choon-Hong Tan
DOI:10.1002/chem.201100687
日期:2011.7.18
of simple esters, the use of them as nucleophiles in directasymmetric transformations is a long‐standing challenge in synthetic organic chemistry. Nature approaches this difficulty through a decarboxylative mechanism, which is used for polyketide synthesis. Inspired by nature, we report guanidine‐catalyzed biomimetic decarboxylative CC and CN bond‐formation reactions. These highly enantioselective
Electronic and steric tuning of chiral diene ligands for rhodium-catalyzed asymmetric arylation of imines
作者:Kazuhiro Okamoto、Tamio Hayashi、Viresh H. Rawal
DOI:10.1039/b904624k
日期:——
Rhodium-catalyzedasymmetricarylation of imines using electronically and sterically-modified chiral diene ligands gave the corresponding diarylmethylamines in high yield and with high enantioselectivity using just 0.3 mol% of catalyst.
A chiral N-linked C2-symmetric bidentate phosphoramidite (N-Me-BIPAM) was newly developed for the rhodium-catalyzed enantioselective addition of arylboronicacids to N-sulfonylimines. This ligand achieved high enantioselectivities in a range of 84–99% ee in additions of arylboronicacids to N-tosyl- and N-nosylarylaldimines.
Asymmetric allylation of sulfonyl imines catalyzed by in situ generated Cu(<scp>ii</scp>) complexes of chiral amino alcohol based Schiff bases
作者:Debashis Ghosh、Prasanta Kumar Bera、Manish Kumar、Sayed H. R. Abdi、Noor-ul H. Khan、Rukhsana I. Kureshy、Hari C. Bajaj
DOI:10.1039/c4ra10929e
日期:——
We have developed a catalytic route for enantioselective synthesis of homoallyl amines through Cu(ii)-Schiff base catalyzed allylation of aryl N-sulfonylimines.
Enantioselective and Rapid Rh-Catalyzed Arylation of <i>N</i>-Tosyl- and <i>N</i>-Nosylaldimines in Methanol
作者:Chun-Chih Chen、Balraj Gopula、Jin-Fong Syu、Jhih-Han Pan、Ting-Shen Kuo、Ping-Yu Wu、Julian P. Henschke、Hsyueh-Liang Wu
DOI:10.1021/jo5012653
日期:2014.9.5
Enantiomericallyenriched tosyl-protected diarylmethylamines were rapidly prepared by the asymmetricaddition of arylboronic acids to N-tosylaldimines under mild conditions in the presence of a catalyst prepared in situ from Rh(I) and a chiral diene ligand. This methodology offers access to diarylmethylamines in good yields with excellent chiral purity at room temperature using MeOH as a solvent and