A general Pd-catalyzed α- and γ-benzylation of aldehydes for the formation of quaternary centers
作者:Ivan Franzoni、Laure Guénée、Clément Mazet
DOI:10.1039/c5ob00702j
日期:——
A palladium-catalyzed benzylation of α-branched aldehydes has been developed using benzyl methyl carbonates. The method gives access to congested quaternary centers in the vicinity of one of the most sensitive carbonyl functionalities and displays unprecedented generality with respect to both coupling partners. Evidence for the direct involvement of a Pd-η3-benzyl intermediate is provided. Extension
Benzyl Protection of Phenols under Neutral Conditions: Palladium-Catalyzed Benzylations of Phenols
作者:Ryoichi Kuwano、Hiroki Kusano
DOI:10.1021/ol800548t
日期:2008.5.1
Benzyl protection of phenols under neutral conditions was achieved by using a Pd(eta3-C3H5)Cp-DPEphos catalyst. The palladium catalyst efficiently converted aryl benzyl carbonates into benzyl-protected phenols through the decarboxylative etherification. Alternatively, the nucleophilic substitution of benzyl methyl carbonates with phenols proceeded in the presence of the catalyst, yielding aryl benzyl
Palladium-catalyzed Cross-coupling of Benzylic Carbonates with Organostannanes
作者:Masato Ohsumi、Ryoichi Kuwano
DOI:10.1246/cl.2008.796
日期:2008.7.5
The cross-coupling of benzylic carbonates with arylstannanes proceeded in the presence of [Pd(η3-C3H5)Cl]2–DPPPent catalyst, affording the desired diarylmethanes in good yield.
Substrate switchable Suzuki–Miyaura coupling for benzyl ester <i>vs.</i> benzyl halide
作者:Masato Ohsumi、Akitaka Ito、Nagatoshi Nishiwaki
DOI:10.1039/c8ra07841f
日期:——
developed to accomplish the substrate switchable Suzuki–Miyaura coupling of benzyl derivatives and arylboronic acid derivatives. Under conditions for esters, benzyl esters such as carbonates and acetates reacted with arylboronic acids to afford the corresponding diarylmethanes. However, the benzyl halides did not react under the same conditions. On the other hand, benzyl halides such as bromides and
Suzuki−Miyaura Cross-Coupling of Benzylic Carbonates with Arylboronic Acids
作者:Ryoichi Kuwano、Masashi Yokogi
DOI:10.1021/ol050078q
日期:2005.3.1
The cross-coupling of benzylic carbonates with arylboronicacids gave the corresponding diarylmethanes in high yields by use of the palladium catalyst generated in situ from [Pd(eta(3)-C(3)H(5))Cl](2) and 1,5-bis(diphenylphosphino)pentane (DPPPent). The Suzuki-Miyaura reaction using DPPPent-palladium catalyst is applicable to syntheses of a broad range of functionalized diarylmethanes. [reaction: see