Catalytic, Enantioselective N-Acylation of Lactams and Thiolactams Using Amidine-Based Catalysts
作者:Xing Yang、Valentina D. Bumbu、Peng Liu、Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Wei Zhang、Xuntian Jiang、K. N. Houk、Vladimir B. Birman
DOI:10.1021/ja306766n
日期:2012.10.24
contrast to alcohols and amines, racemic lactams and thiolactams cannot be resolved directly via enzymatic acylation or classical resolution. Asymmetric N-acylation promoted by amidine-based catalysts, particularly Cl-PIQ 2 and BTM 3, provides a convenient method for the kinetic resolution of these valuable compounds and often achieves excellent levels of enantioselectivity in this process. Density
Dirhodium Tetracarboxylates Derived from Adamantylglycine as Chiral Catalysts for Enantioselective C−H Aminations
作者:Ravisekhara P. Reddy、Huw M. L. Davies
DOI:10.1021/ol061742l
日期:2006.10.1
The dirhodium tetracarboxylate, Rh-2(S-TCPTAD)(4), derived from adamantylglycine, is an effective chiral catalyst for both inter- and intramolecular C-H aminations.
SIBI, MUKUND P.;RENHOWE, PAUL A., TETRAHEDROM LETT., 31,(1990) N1, C. 7407-7410
作者:SIBI, MUKUND P.、RENHOWE, PAUL A.
DOI:——
日期:——
Catalytic enantioselective synthesis of β-amino alcohols by nitrene insertion
Chiralβ-aminoalcohols are important building blocks for the synthesis of drugs, natural products, chiralauxiliaries, chiral ligands and chiral organocatalysts. The catalytic asymmetric β-amination of alcohols offers a direct strategy to access this class of molecules. Herein, we report a general intramolecular C(sp3)-H nitrene insertion method for the synthesis of chiral oxazolidin-2-ones as precursors
Novel Stereoselective Synthesis of Functionalized Oxazolidinones from Chiral Aziridines
作者:Chan Sun Park、Min Sung Kim、Tae Bo Sim、Do Kyu Pyun、Cheol Hae Lee、Daeock Choi、Won Koo Lee、Jae-Won Chang、Hyun-Joon Ha
DOI:10.1021/jo025545l
日期:2003.1.1
Enantiomerically pure N-(R)-alpha-methylbenzyl-4(R)-(chloromethyl)oxazolidinones (4R)-5a-k were synthesized in one step and high yields from various aziridine-2-methanols (S)-2a-k by intramolecular cyclization with phosgene. The alpha-methylbenzyl substituent on the nitrogen was easily cleaved to give both enanatiomers of 4-(chloromethyl)oxazolidinones (R)-7a and (S)-7a. (R)-7a was used for the efficient