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
A gold‐catalyzed tandem cyclization of o‐phenylenediamines with ynones to synthesize benzo[b]indeno[1,2‐e][1,4]diazepine has been developed. The mechanism was explored by control experiments. The method provides a way to access a range of benzo[b]indeno[1,2‐e][1,4]diazepine derivatives in diversity‐oriented synthesis aiming at discovering structurally diverse scaffolds.
已经开发了金催化的邻苯二胺与炔酮的串联串联环化反应,以合成苯并[ b ]茚并[1,2- e ] [1,4]二氮杂pine 。通过控制实验探索了该机制。该方法提供了一种在面向多样性的合成中访问一系列苯并[ b ]茚并[1,2- e ] [1,4]二氮杂苯衍生物的方法,旨在发现结构多样的支架。
Gold-Catalyzed Formal Cycloaddition of 2-Ethynylbenzyl Ethers with Organic Oxides and α-Diazoesters
作者:Samir Kundlik Pawar、Chiou-Dong Wang、Sabyasachi Bhunia、Appaso Mahadev Jadhav、Rai-Shung Liu
DOI:10.1002/anie.201303016
日期:2013.7.15
A world of possibilities: Gold‐catalyzed reactions of 2‐ethynylbenzyl ethers with organicoxides and α‐diazoesters gave 1,3‐dihydroisobenzofuran and naphthalene derivatives, respectively (see scheme; EWG=electron‐withdrawing group). Mechanisms for the formation of the formal cycloadducts were elucidated by isotope labeling.
Gold(I)-Catalyzed Enantioselective Carboalkoxylation of Alkynes
作者:Weiwei Zi、F. Dean Toste
DOI:10.1021/ja407150h
日期:2013.8.28
A highly enantioselective carboalkoxylation of alkynes catalyzed by cationic (DTBM-MeO-Biphep)gold(I) complexes is reported. Various optically active β-alkoxyindanone derivatives were obtained in good yields with high enantioselectivities. Furthermore, this methodology was extended to the enantioselective synthesis of 3-methoxycyclopentenones. The reaction is proposed to proceed through an enantioselective
The syntheses of 2,2′-spirobi[indene] derivatives based on a gold(I)-catalyzed tandem strategy involving intramolecular methoxylation/double aldol condensation were achieved. Examination of the scope of this tandem reaction by using a batch of alkynone substrates disclosed that the reaction possessed a good functional group tolerance. A cationic gold(I) catalyst/protonic acid-catalyzed mechanism for