Pd-Catalyzed allylic alkylation of secondary nitroalkanes
作者:Keisuke Maki、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1016/j.tet.2007.03.062
日期:2007.5
A Pd-catalyzed allylicalkylation of secondary nitroalkanes, using a catalytic amount of external base, was developed. Simple allyl carbonate and monosubstituted allyl carbonates were used as electrophiles, and bulky secondary nitroalkanes were used as nucleophiles. This is the first catalytic allylicalkylation of bulky secondary nitroalkanes, such as 2-nitroheptane. The use of the strong base DBU
Chemoselective O-tert-butoxycarbonylation of hydroxy compounds using NaLaTiO4 as a heterogeneous and reusable catalyst
作者:Savita J. Singh、Radha V. Jayaram
DOI:10.1016/j.tetlet.2008.04.149
日期:2008.6
A facile, efficient and chemoselective protocol for O-tert-butoxycarbonylation of various hydroxycompounds has been developed using NaLaTiO4 (layered perovskite) as a novel catalyst. The catalyst showed remarkable activity and reusability affording high yields of the desired products under mild reaction conditions.
Palladium catalyzed cascade umpolung allylation/acetalation for the construction of quaternary 3-amino oxindoles
作者:Xi-Shang Sun、Xin Chang、Li-Min Shi、Zuo-Fei Wang、Liang Wei、Chun-Jiang Wang
DOI:10.1039/d1cc03075b
日期:——
Herein we reported a highly diastereoselective synthesis of quaternary 3-amino oxindoles bearing an acetal unit via a palladiumcatalyzed three-component cascade umpolung allylation/acetalation process. An array of 3-amino 3-allyl oxindoles incorporating diversified functional groups were prepared in good yields with exclusive diastereoselectivities. Further investigation demonstrated that the current
A relay Rh(ii)/Pd(0) dual catalysis that enables domino [1,2]-sigmatropic rearrangement/allylic alkylation of α-diazo tertiary alcohols is described. This transformation represents a highly efficient method for the one-pot synthesis of α-quaternary β-keto-esters under mild conditions, in which two separate C-C σ-bonds at the carbenic center were formed in a straightforward manner.
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