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...
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。
Asymmetric γ-Allylation of α,β-Unsaturated Aldehydes by Combined Organocatalysis and Transition-Metal Catalysis
作者:Line Naesborg、Kim Søholm Halskov、Fernando Tur、Sofie M. N. Mønsted、Karl Anker Jørgensen
DOI:10.1002/anie.201504749
日期:2015.8.24
The first asymmetric regio‐ and diastereodivergent γ‐allylation of cyclic α,β‐unsaturated aldehydes based on combined organocatalysis and transition‐metal catalysis is disclosed. By combining an aminocatalyst with an iridium catalyst, both diastereomers of branched allylated products can be achieved in moderate to good yields and excellent regio‐ and stereoselectivities. Furthermore, by replacing the
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
Arylations of allylic acetates with triarylbismuths as atom-efficient multi-coupling reagents under palladium catalysis
作者:Maddali L.N. Rao、Debasis Banerjee、Somnath Giri
DOI:10.1016/j.tetlet.2009.07.148
日期:2009.10
Arylation of allylic acetates employing triarylbismuths as multi-coupling reagents under palladium-catalyzed conditions was reported. Triarylbismuths as nucleophilic coupling partners were used in sub-stoichiometric amounts with respect to allylic acetates and thus served as atom-efficient multi-coupling reagents. A variety of allylic acetates were cross-coupled with triarylbismuths to furnish the