The performance of tert-butanesulfinamides as nitrogen nucleophiles in Pd(0)-catalyzed allylic substitution reactions has been investigated. Metalated N-alkyl and N-acetyl sulfinamides have been identified as suitable partners for the reaction with π-allyl–palladium complexes. The cross-coupling of N-acetyl tert-butanesulfinamide with 2- or 3-substituted linear allylic carbonates is achieved in the
Iridium-Catalyzed Allylic Vinylation and Asymmetric Allylic Amination Reactions with<i>o</i>-Aminostyrenes
作者:Ke-Yin Ye、Hu He、Wen-Bo Liu、Li-Xin Dai、Günter Helmchen、Shu-Li You
DOI:10.1021/ja2092954
日期:2011.11.23
developed. Mechanistic studies of the allylic vinylation reaction have been carried out, and the results suggest that the leaving group of the allylic precursor plays a key role in directing the reaction pathway. Screening of various allylic precursors showed that Ir-catalyzed reactions of allyl diethyl phosphates with o-aminostyrene derivatives proceed via an allylicamination pathway. A subsequent ring-closing
已经实现了烯丙基碳酸酯与邻氨基苯乙烯衍生物的 Ir 催化烯丙基乙烯基化反应,提供了跳过的 (Z,E)-二烯衍生物。以 (E)-but-2-ene-1,4-diyl二碳酸二甲酯为底物,通过 Ir 催化的多米诺烯丙基乙烯基化/分子内烯丙基胺化反应有效地对映选择性合成 1-苯并氮杂衍生物。已经进行了烯丙基乙烯基化反应的机理研究,结果表明烯丙基前体的离去基团在指导反应途径中起着关键作用。对各种烯丙基前体的筛选表明,Ir 催化的磷酸烯丙酯与邻氨基苯乙烯衍生物的反应是通过烯丙基胺化途径进行的。随后胺化产物的闭环复分解 (RCM) 反应产生了一系列对映异构富集的 1,2-二氢喹啉衍生物。(-)-angustureine 的不对称全合成表明了它们的效用。
Ni-Catalyzed Reductive Allylation of Unactivated Alkyl Halides with Allylic Carbonates
作者:Yijing Dai、Fan Wu、Zhenhua Zang、Hengzhi You、Hegui Gong
DOI:10.1002/chem.201102984
日期:2012.1.16
catalytic Ni species in the presence of an environmentally benign Zn reductant, delivering allylated alkanes (see scheme). This unprecedented approach allowed a variety of unactivated alkylhalides and substituted allyliccarbonates to regioselectively afford E‐alkenes in good to excellent yields.
Features and Applications of [Rh(CO)<sub>2</sub>Cl]<sub>2</sub>-Catalyzed Alkylations of Unsymmetrical Allylic Substrates
作者:Brandon L. Ashfeld、Kenneth A. Miller、Anna J. Smith、Kristy Tran、Stephen F. Martin
DOI:10.1021/jo701290b
日期:2007.11.1
A novel regio- and stereoselective [Rh(CO)2Cl]2-catalyzed allylic alkylation of unsymmetrical allylic carbonates was discovered. The regioselectivity of the reaction favors product ratios in which substitution occurs at the carbon bearing the leaving group. When an enantiomerically enriched carbonate (≥99% ee) was examined, the Rh(I)-catalyzed allylic alkylation proceeded stereoselectively to provide
Cp*Co(III)-Catalyzed γ-Selective C–H Allylation/Hydroamination Cascade for the Synthesis of Dihydroisoquinolines
作者:Suh Young Choi、Hyeon Dae Kim、Jong-Un Park、Sun-a Park、Ju Hyun Kim
DOI:10.1021/acs.orglett.9b03977
日期:2019.12.20
A Cp*Co(III)-catalyzed γ-selective C-H allylation/hydroamination cascade toward the synthesis of 3,4-dihydroisoquinolines (DHIQs) has been successfully developed, starting from NH ketimines and allyl carbonates. Notably, highly efficient and γ-selective C-H allylations were accomplished using γ-substituted allyl reagents, thus overcoming the issues of poor α/γ selectivity and low reactivity of previous