Pd-catalyzed asymmetric allylicalkylation reactions of acyclicketones with monosubstituted allyl substrates using 1,1‘-P,N-ferrocene with H as substituent on the oxazoline ring as ligand gave products having two chiral centers with high yields and with high regio-, diastereo-, and enantioselectivities, with the ratio of branched and linear products being 98:2, anti:syn ratio for branched products
Pd 催化无环酮与单取代烯丙基底物的不对称烯丙基烷基化反应,使用 1,1'-P,N-二茂铁,H 作为恶唑啉环上的取代基作为配体,得到具有两个手性中心的高产率和高区域-,非对映选择性和对映选择性,支链和线性产物的比例为 98:2,支链产物的反:syn 比例为 7-21:1,反产物的 ee 为 92-99%。
Highly regioselective Pd-catalyzed allylic alkylation of fluorobis(phenylsulfonyl)methane
A highly regioselective palladium-catalyzedallylic alkylation of fluorobis(phenylsulfonyl)methane has been studied. Using different allylic carbonates, a variety of terminal mono-fluoromethylated compounds were achieved in 85–99% yields with high regioselectivities.
Pd-Catalyzed desulfitative arylation of olefins by <i>N</i>-methoxysulfonamide
作者:Subhadra Ojha、Niranjan Panda
DOI:10.1039/d1ob02360h
日期:——
A novel Pd-catalyzed protocol for the desulfitative Heck-type reaction of N-methoxy aryl sulfonamides with alkenes was reported. The cross-coupling reaction was performed successfully with a variety of olefins to obtain aryl alkenes. Different substituents on the aromatic ring of N-methoxysulfonamides were also found to be compatible with the reaction conditions. Expectedly, the reaction proceeds through
The use of sodium 2-aminobenzenethiolate in the enantioselective iridium catalyzed allylic substitution with a range of methyl allyl carbonates allows the concise synthesis of the branch-type products with both excellent regio- and enantioselectivities, which are functionalized N,S-containing allylic intermediates for the formation of chiral benzo-fused N,S-heterocycles.
Stereodivergent Allylation of Azaaryl Acetamides and Acetates by Synergistic Iridium and Copper Catalysis
作者:Xingyu Jiang、Philip Boehm、John F. Hartwig
DOI:10.1021/jacs.7b12824
日期:2018.1.31
We report stereodivergent allylic substitution reactions of allylic esters with prochiral enolates derived from azaaryl acetamides and acetates to form products from addition of the enolates at the most substituted carbon of an allyl moiety with two catalysts, a chiral metallacyclic iridium complex and a chiral bisphosphine-ligated copper(I) complex, which individually control the configuration of