Bis(perfluoroalkyl) Phosphino-Oxazoline: A Modular, Stable, Strongly π-Accepting Ligand for Asymmetric Catalysis
作者:Zongjian Hu、Yuguang Li、Kai Liu、Qilong Shen
DOI:10.1021/jo3011717
日期:2012.9.21
A new class of stable, strongly π-accepting and modular bis(perfluoroalkyl)-phosphine-oxazoline ligands (FOX) as CO mimics was prepared. It was demonstrated that these ligands, when coordinated to palladium catalysts, promote the asymmetric alkylation of monosubstituted allyl substrates with excellent regio- and enantioselectivity. Solid and solution structure analysis of the FOX-ligated Pd-allyl intermediate
Highly regioselective iridium-catalyzed and samarium-promoted coupling of allylic carbonates with ketones: a new approach towards homoallylic alcohols
作者:Wei Liu、Liang Zhang、Weikang Yang、Xiaoming Zhao
DOI:10.1039/c3ra43199a
日期:——
A highlyregioselective Ir-catalyzed and Sm-promoted coupling of allyliccarbonates with ketones has been realized, which provides the homoallylic alcohols in up to 89% yields. This strategy gives a convenient method for the synthesis of liquid crystals with a mono-fluorinated quaternary carbon chain.
Iridium‐Catalyzed Propenylation Reactions for the Synthesis of 4‐Pyridone Derivatives
作者:Xue‐dan Bai、Jie Wang、Ying He
DOI:10.1002/adsc.201801177
日期:2019.2
propenylation reaction of allylic carbonates with 4‐hydroxypyridine derivatives. The process efficiently provides 4‐pyridone derivatives with high stereoselectivities under mild conditions. The products could constitute valuable building blocks for the synthesis of natural products and other bioactive molecules. Preliminary mechanistic studies indicated that a tandemallylic substitution/isomerization
作者:Can-Can Bao、Dong-Song Zheng、Xiao Zhang、Shu-Li You
DOI:10.1021/acs.organomet.8b00762
日期:2018.12.24
N-Heterocyclic carbenes (NHCs) were found to be suitable ligands in Ir-catalyzed intermolecular allylic alkylation reaction. In the presence of a catalyst derived from [Ir(dncot)Cl]2 (dncot = dinaphthocyclooctatetraene) and triazolium salt L7, the alkylation products from the reaction of aryl allyl carbonates with sodium dialkyl malonates could be obtained in 85–99% yields favoring the formation of
发现N-杂环卡宾(NHC)是Ir催化的分子间烯丙基烷基化反应中的合适配体。在[Ir(dncot)Cl] 2(dncot =二萘环辛酸酯四烯)和三唑鎓盐L7衍生的催化剂存在下,芳基烯丙基碳酸酯与二烷基丙二酸钠的反应可得到烷基化产物,收率高达85-99%,形成支链产物(90/10→> 99/1 b / l)。此外,手性二氢异喹啉型NHC(DHIQ-NHC)(L8)已成功应用于Ir催化的不对称烯丙基烷基化反应中。对于广泛的底物,获得了优异的对映选择性和中等的区域选择性。
Regio- and Enantioselective Pd-Catalyzed Allylic Amination of Monosubstituted Allylic Substrates with BocNHOMe
作者:Xue-Long Hou、Bao-Hui Zheng、Chang-Hua Ding
DOI:10.1055/s-0030-1261187
日期:2011.9
A new type of N-nucleophile has been developed in Pd-catalyzed asymmetric allylic amination with monosubstituted allyl substrates, affording corresponding branched allyl amines in high regio- and enantioselectivities. Either OMe or Boc group in products can be removed easily to provide primary amine derivatives with the optical purity unchanged.