ligands in titanium tetraisopropoxide promoted enantioselectiveaddition of phenylacetylene to benzaldehyde and selected aromatic and aliphatic aldehydes. The N-3,5-bis(trifluoromethyl)benzenesulfonamido-d-glucosamine derivative was chosen as the most efficient ligand for this addition. The reaction is highlyenantioselective for several aromatic aldehydes and enantiomeric excesses up to 92% were obtained
Cooperative Catalysis of Metal and OH⋅⋅⋅O/sp<sup>3</sup>-CH⋅⋅⋅O Two-Point Hydrogen Bonds in Alcoholic Solvents: Cu-Catalyzed Enantioselective Direct Alkynylation of Aldehydes with Terminal Alkynes
with a transition‐metal center in alcoholic solvents for enantioselective catalysis. Copper(I) complexes with prolinol‐based hydroxy amino phosphane chiral ligands catalytically promoted the directalkynylation of aldehydes with terminal alkynes in alcoholic solvents to afford nonracemic secondary propargylic alcohols with high enantioselectivities. Quantum‐mechanical calculations of enantiodiscriminating
Asymmetric synthesis of propargylic alcohols catalyzed by (−)-MITH
作者:Ping-Yu Wu、Hsyueh-Liang Wu、Ying-Ying Shen、Biing-Jiun Uang
DOI:10.1016/j.tetasy.2009.07.032
日期:2009.8
This investigation describes that in the presence of 2.5 mol % of (-)-2-exo-morpholinoisobornane-10-thiol (MITH) 1, catalytic asymmetric alkynylation of aldehydes gives enantioenriched propargylic alcohols with good enantioselectivities. (C) 2009 Elsevier Ltd. All rights reserved.
Amino thiols versus amino alcohols in the asymmetric alkynylzinc addition to aldehydes
作者:Sílvia Subirats、Ciril Jimeno、Miquel A. Pericàs
DOI:10.1016/j.tetasy.2009.05.029
日期:2009.7
A series of modular amino thiol and amino alcohol ligands have been synthesized in enantiopure form from common enantiopure precursors. Their structures have been optimized for performance in the asymmetric alkynylzinc addition to aldehydes, and a direct comparison of the effect of the S and 0 coordinating atoms on the catalytic outcome of these ligands has been performed. Amino thiols have shown to be superior as ligands for this type of chemistry. (C) 2009 Elsevier Ltd. All rights reserved.
Enantioselective addition of organozinc reagents to carbonyl compounds catalyzed by a camphor derived chiral γ-amino thiol ligand
作者:Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ni Cheng、Biing-Jiun Uang
DOI:10.1016/j.tet.2015.07.038
日期:2016.5
synthesis of the chiral camphor derived γ-amino thiol ligand 17 and its application in catalytic enantioselective carbon-carbon forming reactions through the addition of organozinc reagents to carbonyl compounds is described. The catalytic activity and enantioselectivity of ligand 17 is demonstrated in the enantioselective addition of various organozinc reagents to aldehydes and ketoesters, offering the corresponding