Effects of Extended Aryl-Substituted Bisoxazoline Ligands in Asymmetric Synthesis - Efficient Synthesis and Application of 4,4′-Bis(1-Naphthyl)-, 4,4′-Bis(2-Naphthyl)- and 4,4′-Bis(9-Anthryl)-2,2′-isopropylidenebis(1,3-oxazolines)
作者:Hester L. van Lingen、Floris L. van Delft、Roy P. M. Storcken、Koen F. W. Hekking、Anouk Klaassen、Jan J. M. Smits、Patrycja Ruskowska、Jadwiga Frelek、Floris P. J. T. Rutjes
DOI:10.1002/ejoc.200500566
日期:2005.12
The steric influence of extended aryl substituents on 2,2′-bis(1,3-oxazoline) ligands was investigated in a series of asymmetric catalytic reactions such as Mukaiyama aldol and Michael reactions, hetero-Diels–Alder processes, and allylic alkylation reactions. 4,4′-(2-Naphthyl)- and 4,4′-(9-anthryl)-substituted isopropylidene-bridged 2,2′-bis(1,3-oxazolines) were synthesized and their enantioselective
<i>C</i><sub>2</sub>-Symmetric Cu(II) Complexes as Chiral Lewis Acids. Catalytic Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates
作者:David A. Evans、Tomislav Rovis、Marisa C. Kozlowski、Jason S. Tedrow
DOI:10.1021/ja983864h
日期:1999.3.1
2016-present Professor Department of Chemistry, Columbia University, New York, NY 2013 Chair, Organometallic Chemistry Directed Towards Organic Synthesis (OMCOS 17) July 28-August 1, 2013 Fort Collins, CO 2012-2018 Permanent Member, Synthetic and Biological Chemistry B Study Section, NIH (SBC-B) 2012-present Associate Editor for the Americas, Synlett 2010-2015 Member, Editorial Board, Organic Reactions
科罗拉多州立大学,柯林斯堡,科罗拉多州 1998-2000 NSERC 博士后研究员 哈佛大学,剑桥,马萨诸塞州,David A. Evans 教授 1993-1998 博士 安大略省多伦多市多伦多大学有机化学与 Mark Lautens 教授 1986-1990 学士 人类生物学多伦多大学,多伦多,安大略省奖项和荣誉
Enantioselective Conjugate Addition of Silylketene Acetals to β-Enamidomalonates. Synthesis of β-Amino Acid Derivatives
作者:Mukund P. Sibi、Jianxie Chen
DOI:10.1021/ol026333d
日期:2002.8.1
Conjugate addition of silylketene acetals or enolsilanes to enamidomalonates proceeds with excellent chemical efficiency and good selectivity using Cu(OTf)(2) and a chiral bisoxazoline. The effect of the Lewis acid, ligand, the N-acyl substituent, and the nucleophile on yield and selectivity for the addition product have been evaluated.