New Schiff bases derived from chiral d‐camphor were determined to be effective phosphine ligands for the asymmetric palladium‐catalyzed allylic alkylation of activated methylene compounds, the allylic etherification of alcohols, and the allylic amination of primary amines or secondary amines, in which the corresponding products with various functional groups were achieved in good yields with excellent
P,Nsp3-bidentate chiral ligands bearing spiro[indane-1,2′-pyrrolidine] backbone were prepared in gram scale for the first time. Pd complexes of these air-stable amino phosphine ligands could catalyze asymmetric allylic substitutions of malonate-, alcohol-, and amine-type nucleophiles in up to 97% ee and 99% yield. A crystal structure of [Pd(II)(η3-1,3-diphenylallyl)(ligand)]PF6 indicated possible transition
New P,N<sub>sp3</sub>ligands for palladium-catalyzed asymmetric allylic substitutions
作者:Qin Su、Chuan-Jin Hou、De-Quan Wei、Hao Qin、Ding-Hua Liang、Xiang-Ping Hu
DOI:10.1039/d3ob00519d
日期:——
New P,Nsp3 bidentate ligands containing two chiral carbon centers were developed and applied to palladium-catalyzedasymmetricallylicsubstitutionreactions. Good generalities with various nucleophiles, including carbon, nitrogen and oxygen containing nucleophiles, were achieved with up to 96% ee and 98% yield. This reaction provides an efficient method for the asymmetric formation of C–C, C–N and
开发了包含两个手性碳中心的新型 P,N sp3双齿配体,并将其应用于钯催化的不对称烯丙基取代反应。与各种亲核试剂(包括含碳、含氮和含氧的亲核试剂)的良好通用性达到了高达 96% 的 ee 和 98% 的产率。该反应为C-C、C-N和C-O键的不对称形成提供了一种有效的方法。
Palladium–(S,pR)-FerroNPS-Catalyzed Asymmetric Allylic Etherification: Electronic Effect of Nonconjugated Substituents on Benzylic Alcohols on Enantioselectivity
作者:Fuk Loi Lam、Terry Tin-Lok Au-Yeung、Fuk Yee Kwong、Zhongyuan Zhou、Kwok Yin Wong、Albert S. C. Chan
DOI:10.1002/anie.200703955
日期:2008.2.1
Chiral SO/P hybrid ligands: an enantioselective switch in palladium-catalyzed asymmetric allylic etherifications
作者:Junwei Xing、Peng Cao、Jian Liao
DOI:10.1016/j.tetasy.2012.03.022
日期:2012.4
A variety of chiral tert-butanesulfinylphosphine ligands were prepared and applied to the palladium-catalyzed asymmetric allylic etherification of 1,3-diphenylpropenyl acetate with alcohols. Excellent yields and moderate enantioselectivities were obtained. The absolute configuration of the etherification products was evidently switched only through the position change of the substituent on the P-aryl groups. (C) 2012 Elsevier Ltd. All rights reserved.