Indenone is made in two steps from indane-1,3-dione, and a by-product is characterised by conversion to s-dibenzofulvalene. Indenone undergoes acid-catalysed addition reactions, and all its six protons have magnetic resonance at higher field than expected.
Chiral Cyclometalated Oxazoline Gold(III) Complex-Catalyzed Asymmetric Carboalkoxylation of Alkynes
作者:Jia-Jun Jiang、Jian-Fang Cui、Bin Yang、Yulu Ning、Nathanael Chun-Him Lai、Man-Kin Wong
DOI:10.1021/acs.orglett.9b02171
日期:2019.8.16
O′-chelated 4,4′-biphenol cyclometalated oxazoline gold(III) complexes has been developed. A high yield (≤89%) and a high enantioselectivity (≤90% ee) were achieved in asymmetric carboalkoxylation of alkynes. Enantioselectivity could be significantly improved from 19% to 90% ee by increasing the steric size of the substituent on the chiral oxazoline ligand. Catalytically active AuIII species and the origin
C,O-Chelated BINOL/Gold(III) Complexes: Synthesis and Catalysis with Tunable Product Profiles
作者:Jian-Fang Cui、Hok-Ming Ko、Ka-Pan Shing、Jie-Ren Deng、Nathanael Chun-Him Lai、Man-Kin Wong
DOI:10.1002/anie.201612243
日期:2017.3.6
Unprecedented stable BINOL/gold(III) complexes, adopting a novel C,O‐chelation mode, were synthesized by a modular approach through combination of 1,1′‐binaphthalene‐2,2′‐diols (BINOLs) and cyclometalated gold(III) dichloride complexes [(C^N)AuCl2]. X‐ray crystallographic analysis revealed that the bidentate BINOL ligands tautomerized and bonded to the AuIII atom through C,O‐chelation to form a five‐membered