Catalytic Asymmetric Synthesis of Allylic Aryl Ethers
摘要:
The reaction of trichloroacetimidate derivatives of (Z)-2-alken-1-ols with phenol nucleophiles in the presence of the palladium(II) catalyst [COP-OAc](2) provides 3-aryloxy-1-alkenes in high yields and high enantiomeric purity (typically 63-90% yield and 90-97% ee). The reaction is exemplified by 20 examples. The method employs 1 mol % of the commercially available catalysts (S)- or (R)-[COPOAc](2), produces the branched isomer with unprecedented regioselectivity, and is compatible with the presence of base-labile functionality in either reactant.
Ir(I)-Catalyzed Enantioselective Decarboxylative Allylic Etherification: A General Method for the Asymmetric Synthesis of Aryl Allyl Ethers
作者:Dongeun Kim、Srinivasa Reddy、Om V. Singh、Jae Seung Lee、Suk Bin Kong、Hyunsoo Han
DOI:10.1021/ol3033237
日期:2013.2.1
Ir(I)-catalyzed enantioselectivedecarboxylative allylic etherification of arylallylcarbonates provides arylallyl ethers. Key to the generality and high stereoselection of the reaction is the use of the intramolecular decarboxylative allylation process and [Ir(dbcot)Cl]2 as an Ir(I) source. Ir(I)-catalyzed diastereoselective decarboxylative allylic etherification, combined with asymmetric aldehyde
Rhodium-Catalyzed Dynamic Kinetic Asymmetric Allylation of Phenols and 2-Hydroxypyridines
作者:Changkun Li、Bernhard Breit
DOI:10.1002/chem.201603532
日期:2016.10.4
dynamic kinetic asymmetric allylation of different nucleophiles with racemic allylic carbonates has been developed. High regio‐ and enantioselectivities can be obtained under neutral conditions and, furthermore, the chemoselectivities can be controlled by different diphosphine ligands. (R,R)‐QuinoxP* leads to selective O‐allylation of phenols, whereas when embedding (S,S)‐DIOP as the ligand, 2‐naphthol
受铑催化羧酸经济向丙二烯中添加羧酸的机理研究的启发,已开发出铑催化的不同亲核试剂与消旋烯丙基碳酸酯的动态动力学不对称烯丙基化反应。在中性条件下可以获得很高的区域选择性和对映选择性,此外,化学选择性可以通过不同的二膦配体来控制。(R,R)-QuinoxP *导致酚的选择性O-烯丙基化,而当嵌入(S,S)-DIOP作为配体时,2-萘酚首次以高对映选择性被邻-C-烯丙基化。为此,羟基吡啶可以通过Rh I /(S)-DTBM-Segphos的中间体与先前报道的对丙二烯的原子经济加成反应相同。
Catalytic Asymmetric Synthesis of Branched Chiral Allylic Phenyl Ethers from (E)-Allylic Alcohols
作者:Angelaâ C. Olson、Larryâ E. Overman、Helenâ F. Sneddon、Josephâ W. Ziller
DOI:10.1002/adsc.200900678
日期:2009.12
family are reported and characterized crystallographically. The di-mu-amidate complex 3 or its enantiomer (ent-3) are the first asymmetric catalysts that allow commercially available, or readily accessible, (E)-2-alkene-1-ols to be transformed to enantioenriched branched allylic aryl ethers upon reaction of their trichloroacetimidate derivatives with phenols. The 3-aryloxy-1-alkene products are formed
报道了第一个二-mu-酰胺二钯配合物和一种新的 COP(钴恶唑啉钯环)钯 (II) 催化剂家族的二-mu-羧酸二钯配合物,并进行了晶体学表征。二-mu-酰胺配合物 3 或其对映异构体 (ent-3) 是第一个不对称催化剂,它允许市售或容易获得的 (E)-2-烯烃-1-醇转化为对映体富集的支链烯丙基芳基醚它们的三氯乙酰亚胺衍生物与酚类反应。3-芳氧基-1-烯烃产物以高对映体纯度(通常为90-98%ee)和有用产率(61-88%)形成。
Effects of Catalyst Activation and Ligand Steric Properties on the Enantioselective Allylation of Amines and Phenoxides
作者:Andreas Leitner、Chutian Shu、John F. Hartwig
DOI:10.1021/ol050029d
日期:2005.3.1
The yields, enantioselectivities, and regioselectivities of the reactions of amines and phenoxides with allylic carbonates in the presence of a metallacyclic iridium catalyst were compared. These data show that both preactivation of the catalyst and the size of the ligand affect the yield, enantioselectivity, and regioselectivity. With the activated catalyst containing a bis-naphthethylamino group, the allylic amination and etherification of a broad range of allylic carbonates occurred in high yields and with high regioselectivities and enantioselectivities.