Reactivity of γ-Hydroxy-α,β-acetylenic Esters with Amines: Facile Synthesis of the Optically Active 4-Amino-2(5<i>H</i>)-furanones
作者:Li-Hong Zhou、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo802592h
日期:2009.3.6
A convenient synthesis of the optically active 4-amino-2(5H)-furanones is discovered by combining an asymmetric alkyne addition to aldehydes and a subsequent aliphatic amine addition. Both steps can be conducted at room temperature and the products are obtained with high enantioselectivity (84−90% ee). The 4-amino-2(5H)-furanones are also found to undergo very facile electrophilic substitution reactions
Regiospecific Hydration of γ-Hydroxy-α,β-acetylenic Esters: A Novel Asymmetric Synthesis of Tetronic Acids
作者:Amaresh R. Rajaram、Lin Pu
DOI:10.1021/ol060377v
日期:2006.5.1
[reaction: see text] The optically active gamma-hydroxy-alpha,beta-acetylenic esters are obtained from the enantioselective reaction of methyl propiolate with both aliphatic and aromatic aldehydes. These compounds can undergo regiospecific hydration in the presence of Zeise's dimer, [PtCl(2)(C(2)H(4))](2), to generate the optically activetetronicacids.
Highly enantioselective catalytic methyl propiolate addition to both aromatic and aliphatic aldehydes
作者:Jian Huang、Siping Wei、Li Wang、Chun Zhang、Shuangxun Li、Pingxian Liu、Xi Du、Qin Wang
DOI:10.1016/j.tetasy.2016.03.009
日期:2016.6
The excellent catalytic effect on methyl propiolate addition to a wide range of aromatic and aliphatic aldehydes promoted by inexpensive and commercially available BINOL-based ligand is reported. The catalyst systems showed high yields and excellent enantioselectivities for aromatic aldehydes, and excellent yields and high enantioselectivities for aliphatic aldehydes. (C) 2016 Elsevier Ltd. All rights reserved.
Highly enantioselective addition of methyl propiolate to aldehydes catalyzed by a titanium(IV) complex of a β-hydroxy amide
Three chiral beta-hydroxy amide ligands were prepared by the reaction of benzyl chloride with amino alcohols derived from L-tyrosine. The titanium(IV) complex of chiral ligand 4a was found to be an effective catalyst for the asymmetric addition of methyl propiolate, to aliphatic and aromatic aldehydes. The gamma-hydroxy-alpha,beta-acetylenic esters were obtained in excellent enantiomeric excesses (up to 94% ee) under optimized conditions. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Highly Enantioselective Catalytic Alkyl Propiolate Addition to Aliphatic Aldehydes
作者:Mark Turlington、Albert M. DeBerardinis、Lin Pu
DOI:10.1021/ol900667g
日期:2009.6.4
A novel H8BINOL-based chiral ligand (S)-3 is found to catalyze the alkyl propiolate addition to aliphatic aldehydes in the presence of ZnEt2 and Ti(OiPr)4 at room temperature with excellent enantioselectivity (89−97% ee).
发现一种新型的基于H 8 BINOL的手性配体(S)-3在室温下在ZnEt 2和Ti(O i Pr)4的存在下以优异的对映选择性(89-97%)催化丙酸烷基酯加成到脂肪族醛中ee)。