Polymeric β-alanine incarcerated Pd(<scp>ii</scp>) catalyzed allylic etherification in water: a mild and efficient method for the formation of C(sp<sup>3</sup>)–O bonds
作者:Mita Halder、Md. Mominul Islam、Sabir Ahammed、Sk. Manirul Islam
DOI:10.1039/c5ra26182a
日期:——
polystyrene and β-alanine. Using this polymer incarcerated palladium(II) catalyst a useful and efficient procedure for stereospecific synthesis of allyl-aryl ethers has been developed. The benzylic, aromatic, and heteroaromatic phenols react with various substituted allyl acetates by this procedure to furnish a library of allyl-aryl and allyl-hetero-aryl ethers in high yields. The catalyst could be recovered
Ir/PTC cooperatively catalyzed asymmetric umpolung allylation of α-imino ester enabled synthesis of α-quaternary amino acid derivatives bearing two vicinal stereocenters
作者:Yong-Liang Su、Yu-Hui Li、Yu-Gen Chen、Zhi-Yong Han
DOI:10.1039/c6cc09654a
日期:——
A novel Ir/PTC cooperatively catalyzed asymmetric umpolung addition of simple [small alpha]-imino esters is developed and it provides facile access to [small alpha]-quaternary amino acidderivatives bearing two vicinal stereocenters. Both the...
A chiralaldehyde is rationally combined with a Lewis acid and a transition metal for the first time to form a triple catalytic system. This cocatalytic system exhibits good catalytic activation and stereoselective-control abilities in the asymmetric α-allylation reaction of N-unprotected amino acid esters and allyl acetates. Optically active α,α-disubstituted α-amino acids (α-AAs) are generated in
Pd-Catalyzed Allylation of Imines to Access α-CF<sub>3</sub>
-Substituted α-Amino Acid Derivatives
作者:Michael Winter、Hyunwoo Kim、Mario Waser
DOI:10.1002/ejoc.201901272
日期:2019.11.14
herein report a high yielding protocol for the direct α‐allylation of easily accessible trifluoropyruvate‐derived imines using Pd‐catalysis. The reaction gives access to a variety of different α‐allylated‐α‐CF3‐amino acids in a straightforward manner, starting from commercially available trifluoropyruvate. We also provide a proof‐of‐concept for an enantioselective protocol (up to er = 75:25) by using
我们在此报告了一种使用 Pd 催化将易于获得的三氟丙酮酸衍生亚胺直接 α-烯丙基化的高产方案。该反应从市售的三氟丙酮酸开始,以直接的方式获得各种不同的 α-烯丙基化-α-CF3-氨基酸。我们还通过使用手性磷烷配体为对映选择性协议(高达 er = 75:25)提供了概念验证。
Dual Ni/Organophotoredox Catalyzed Allylative Ring Opening Reaction of Oxabenzonorbornadienes and Analogs
作者:Abdoul G. Diallo、Déborah Paris、Djiby Faye、Sylvain Gaillard、Mark Lautens、Jean-Luc Renaud
DOI:10.1021/acscatal.2c00512
日期:2022.3.18
A general approach for the allylation of oxa- and azabenzonorbornadienes is reported by merging organophotoredox and nickel catalysis. This methodology allowed the diastereoselective allylation of various heterocyclic alkene derivatives with a broader range of allylic acetate compounds compared to previously published procedures. Moreover, no air-sensitive organometallic species and no metal reductants