Highly Enantioselective Phenylacetylene Additions to Both Aliphatic and Aromatic Aldehydes
作者:Ge Gao、David Moore、Ru-Gang Xie、Lin Pu
DOI:10.1021/ol026921r
日期:2002.11.1
The readilyavailable and inexpensive BINOL in combination with Ti(O(i)Pr)(4) is found to catalyze the reaction of an alkynylzinc reagent with various types of aldehydes including aliphaticaldehydes, aromaticaldehydes, and other alpha,beta-unsaturated aldehydes to generate chiral propargyl alcohols with 91-99% ee at room temperature. No previous chiral catalysts have exhibited such a broad scope
Asymmetric Alkynyl Additions to Aldehydes Catalyzed by Tunable Oxovanadium(V) Complexes of Schiff Bases of β-Amino Alcohols
作者:Han-Mou Gau、Sheng-Hsiang Hsieh
DOI:10.1055/s-2006-948195
日期:2006.8
The first example of asymmetric alkynyl additions to aldehydes catalyzed by oxovanadium(V) catalysts of tridentate Schiffbases of β-amino alcohols 3a-h is reported. Catalytic reactions employing the best-performing catalyst 3g furnish chiral propargyl alcohols in good to excellent enantioselectivities from 73% to 99% ee.
Enantioselective Synthesis of Chiral Propargylic Alcohols Catalyzed by Bifunctional Zinc-Based Complexes
作者:Xinhua Lu、Guanlei Xie、Tingyi Li、Xiaoming Qu、Jincheng Mao
DOI:10.1080/00397911.2010.531367
日期:2012.3.15
Abstract This work demonstrates an efficient way to prepare chiral propargylicalcohols by asymmetric addition of terminal Zn-acetylide to aldehydes catalyzed by bifunctional zinc-based complexes. The corresponding products with moderate to good yields and enantioselectivities were obtained in the absence of moisture-sensitive Ti(O i Pr)4. GRAPHICAL ABSTRACT
摘要 这项工作展示了一种通过将末端 Zn-乙炔化物不对称加成到由双功能锌基配合物催化的醛类制备手性炔丙醇的有效方法。在不存在对水分敏感的 Ti(O i Pr) 4 的情况下,获得了具有中等至良好产率和对映选择性的相应产品。图形概要
Enantioselective Alkynylation of Aromatic Aldehydes Catalyzed by a Sterically Highly Demanding Chiral-at-Rhodium Lewis Acid
The enantioselective catalytic alkynylation of aromatic aldehydes is reported using a sterically highly hindered bis-cyclometalated rhodium-based Lewis acid catalyst featuring the octahedral metal as the only stereogenic center. Yields of 58–98% with 79–98% enantiomeric excess were achieved using 1–2 mol % of catalyst. This work complements previous work from our laboratory on the enantioselective alkynylation
Asymmetric Addition of Phenylacetylene to Aldehydes Catalyzed by β-Sulfonamide Alcohol-Titanium Complex
作者:Zhaoqing Xu、Li Lin、Jiangke Xu、Wenjin Yan、Rui Wang
DOI:10.1002/adsc.200505453
日期:2006.3
A series of β-sulfonamide alcohol ligands were synthesized from L-phenylalanine. Titanium complexes of these compounds were used to catalyze the asymmetricaddition of phenylacetylene to a number of aldehydes. When the conditions were optimized, 20 mol % of ligand 8a catalyzed the reaction with high enantioselectivity (up to 98% ee) and good yield (up to 92%). When a small amount of MeOH was added