Enantioselective Iridium-Catalyzed Allylic Substitution with 2-Methylpyridines
作者:Xi-Jia Liu、Shu-Li You
DOI:10.1002/anie.201700433
日期:2017.3.27
An enantioselective iridium‐catalyzed allylicsubstitution with a set of highly unstabilized nucleophiles generated in situ from 2‐methylpyridines is described. Enantioenriched 2‐substituted pyridines, which are frequently encountered in natural products and pharmaceuticals, could be easily constructed by this simple method in good yields and excellent enantioselectivity. The synthetic utility of the
描述了用2-甲基吡啶原位生成的一组高度不稳定的亲核试剂进行对映选择性铱催化的烯丙基取代。天然产物和药物中经常遇到的富含对映体的2-取代的吡啶可以通过这种简单方法以高收率和出色的对映选择性轻松地构建。吡啶产物的合成用途通过已报道的Na + / H +交换抑制剂的关键中间体的合成和(-)-番茄红素A的总合成得以证明。
Contemporaneous Dual Catalysis: Chemoselective Cross-Coupling of Catalytic Vanadium–Allenoate and π-Allylpalladium Intermediates
作者:Barry M. Trost、Xinjun Luan、Yan Miller
DOI:10.1021/ja204817y
日期:2011.8.17
This paper presents a detailed investigation of a dual catalytic system that combines a vanadium-catalyzed Meyer-Schuster rearrangement and a palladium-catalyzedallylicalkylation. The implementation of this novel reaction relies on matching the formation rates of vanadium-allenoate and π-allylpalladium intermediates with their bimolecular coupling rate in order to minimize the undesired protonation
Photocatalytic Umpolung Synthesis of Nucleophilic π-Allylcobalt Complexes for Allylation of Aldehydes
作者:Caizhe Shi、Fusheng Li、Yuqing Chen、Shuangjie Lin、Erjun Hao、Zhuowen Guo、Urwa Tul Wosqa、Dandan Zhang、Lei Shi
DOI:10.1021/acscatal.0c05330
日期:2021.3.5
method for the allylation of aldehydes. This paper describes the photocatalytic umpolung strategy for the synthesis of nucleophilic allylcobalt complexes through a single-electron-transfer (SET) process. This strategy enables the metallaphotoredox allylation of carbonyls with allyl acetate using organic N,N-diisopropylethylamine as the terminal reductant bypassing the use of a stoichiometric amount of
A highly efficient catalyst for Pd-catalyzed cyclopropanation was developed using a bulkier N-heterocyclic carbene ligand, with which the nitriles reacted with mono substitutedallyl reagents to afford cyclopropanes in high yields with high cyclopropanation/allylation and enantioselectivities. The reasons for cyclopropanation were investigated and the usefulness of the products was demonstrated.
Synergistic Cu/Pd Catalysis for Enantioselective Allylation of Ketimine Esters: The Direct Synthesis of α-Substituted α-Amino Acids and 2<i>H-</i>
Pyrrols
作者:Liang Wei、Lu Xiao、Chun-Jiang Wang
DOI:10.1002/adsc.201800986
日期:2018.12.21
An efficient synergistic Cu/Pd catalyzed enantioselective α‐allylation of acyclic ketimine esters has been reported, which provides an entry to nonproteinogenic α‐allyl α‐amino acids in high yield, exclusive regioselectivity, and excellent enantioselectivity. Moreover, the more challenging cyclic ketimine ester could also be employed as a nucleophile for the construction of 3,4‐dihydro‐2H‐pyrrole derivatives