Readily available phosphoramidites incorporating TADDOL-related diols with an acyclic backbone turned out to be excellent ligands for asymmetric gold catalysis, allowing a number of mechanistically different transformations to be performed with good to outstanding enantioselectivities. This includes [2 + 2] and [4 + 2] cycloadditions of ene-allenes, cycloisomerizations of enynes, hydroarylation reactions
作者:Allegra Franchino、Àlex Martí、Antonio M. Echavarren
DOI:10.1021/jacs.1c11978
日期:2022.3.2
data, and studies of solvent and nonlineareffects substantiate the key H-bonding interaction at the heart of the catalytic system. This conceptually novel approach, which lies at the intersection of metal catalysis, H-bond organocatalysis, and asymmetric counterion-directed catalysis, provides a blueprint for the development of supramolecularly assembled chiral ligands for metal complexes.
Atropisomeric [(diphosphine)Au<sub>2</sub>Cl<sub>2</sub>] Complexes and their Catalytic Activity Towards Asymmetric Cycloisomerisation of 1,6-Enynes
作者:Elena M. Barreiro、Ekaterina V. Boltukhina、Andrew J. P. White、King Kuok Mimi Hii
DOI:10.1002/chem.201404496
日期:2015.2.2
appear to be very dependent upon the phosphorous substituent. Conversely, the same effect was not observed for ligands based on the binaphthyl (BINAP) series. The catalytic activity of these complexes was subsequently assessed in the enantioselective cycloisomerisation of 1,6‐enynes and revealed an over‐riding electroniceffect: more‐electron‐rich phosphines promote greater enantioselectivity. The possibility
Asymmetric Au(i)-catalyzed synthesis of bicyclo[4.1.0]heptene derivatives via a cycloisomerization process of 1,6-enynes
作者:Chung-Meng Chao、Denis Beltrami、Patrick Y. Toullec、Véronique Michelet
DOI:10.1039/b913554e
日期:——
presence of a chiral cationic Au(i) catalyst ((R)-4-MeO-3,5-(t-Bu)(2)-MeOBIPHEP-(AuCl)(2)/AgOTf system) in toluene under mild conditions and lead to functionalized bicyclo[4.1.0]heptenederivatives in excellent enantiomeric excesses ranging from 90-98%.