Enantioselective Lewis Acid Catalyzed Michael Reactions of Alkylidene Malonates. Catalysis by <i>C</i><sub>2</sub>-Symmetric Bis(oxazoline) Copper(II) Complexes in the Synthesis of Chiral, Differentiated Glutarate Esters
作者:David A. Evans、Tomislav Rovis、Marisa C. Kozlowski、C. Wade Downey、Jason S. Tedrow
DOI:10.1021/ja002246+
日期:2000.9.1
C2-symmetricbis(oxazoline)−Cu(II) complexes 1 catalyze the Mukaiyama Michael reaction of alkylidene malonates and enolsilanes. The use of hexafluoro-2-propanol is essential to induce catalyst turnover. High enantioselectivities are exhibited by bulky alkylidene malonate β-substituents using catalyst 1a. The glutarate ester products are readily decarboxylated to provide chiral 1,5-dicarbonyl synthons
<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
An exo- and Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides with Alkylidene Malonates Catalyzed by a N,O-Ligand/Cu(OAc)2-Derived Chiral Complex
作者:Ming Wang、Zheng Wang、Yu-Hua Shi、Xiao-Xin Shi、John S. Fossey、Wei-Ping Deng
DOI:10.1002/anie.201007960
日期:2011.5.16
An exo‐lent catalyst: An N,O‐ligand/Cu(OAc)2 derived chiral complex is an excellent catalyst for inducing asymmetry in the catalytic enantioselective 1,3‐dipolar cycloadditions of azomethineylides with various alkylidene malonates. A series of highly functionalized exo‐pyrrolidines were obtained in excellent yields (80–99 %) and enantioselectivities (91–99 % ee; see scheme; M.S.: molecular sieve)
Enantioselective Conjugate Addition of <i>N</i>,<i>N</i>-Dialkylhydrazones to α-Hydroxy Enones
作者:David Monge、Eloísa Martín-Zamora、Juan Vázquez、Manuel Alcarazo、Eleuterio Álvarez、Rosario Fernández、José M. Lassaletta
DOI:10.1021/ol071055+
日期:2007.7.1
The activation of alpha-hydroxy enones by the Zn(OTf)2/tBuBOX catalyst enables the enantioselectiveconjugateaddition of 1-methyleneaminopyrrolidine as a neutral d1 synthon. Experimental evidence supports a stereochemical model where a triflate ligand controls the geometry of the catalyst-substrate complex by means of a OH-OTf hydrogen bond. The synthesis of beta-cyano acids illustrates the potential
The Michaeladdition of lithium 1,3-dien-2-olates with α,β-unsaturated carbonyl compounds is described. With α,β-unsaturated esters the reaction was reversible even at −78°C, while kinetically controlled with α,β-unsaturated ketones or alkylidenemalonates. At room temperature, the initially formed Michael adducts undergo subsequent intramolecular Michaeladdition to give substituted cyclohexanone derivatives