Palladium-Catalyzed Carbonylative Cyclization of Aryl Alkenes/Alkenols: A New Reaction Mode for the Synthesis of Electron-Rich Chromanes
作者:Shuang Li、Fuzhuo Li、Jianxian Gong、Zhen Yang
DOI:10.1021/acs.orglett.5b00214
日期:2015.3.6
The Pd(II)-catalyzed intramolecular carbonylative cyclization reaction of aryl alkenes and aryl alkenols is reported for the synthesis of structurally diverse chromanes. PdCl2(CH3CN)2 was used as the catalyst and CuCl2 as the oxidant under the balloon pressure of CO. The reaction is conducted under mild conditions, and chromane-type esters and lactones can be generated in a highlyregio- and stereoselective
Substrate Control in the Asymmetric Aminohydroxylation of Monosubstituted Alkenes: The Enantioselective Synthesis of GABOB and Homoserine Derivatives
作者:Malcolm D. McLeod、Michael Harding、Jennifer A. Bodkin、Craig A. Hutton
DOI:10.1055/s-2005-918939
日期:——
group in the asymmetric aminohydroxylation reaction of but-3-en-1-ol derivatives. Either regioisomeric product can he obtained with useful levels of eoantioselectivity, allowing for the short enantioselective synthesis of GABOB and homoserine derivatives.
The asymmetric aminohydroxylation route to GABOB and homoserine derivatives
作者:Michael Harding、Jennifer A. Bodkin、Fatiah Issa、Craig A. Hutton、Anthony C. Willis、Malcolm D. McLeod
DOI:10.1016/j.tet.2008.11.037
日期:2009.1
The 4-nitrophenyl ether is an efficient directing group in the asymmetric aminohydroxylation reaction of homoallylic ether derivatives. Either regioisomeric product can be obtained with useful levels of enantioselectivity allowing for the short enantioselective synthesis of GABOB and homoserine derivatives. A model based on substrate-catalyst interactions is presented to explain the regio- and enantioselectivity of the aminohydroxylation reactions. (C) 2008 Elsevier Ltd. All rights reserved.
Intramolecular Photochemical Reactions of Bichromophoric 3-(Alkenyloxy)phenols and 1-(Alkenyloxy)-3-(alkyloxy)benzene Derivatives. Acid-Catalyzed Transformations of the Primary Cycloadducts
作者:Norbert Hoffmann、Jean-Pierre Pete
DOI:10.1021/jo970554t
日期:1997.10.1
Irradiation of 3-(alkenyloxy)phenols and 1-(alkenyloxy)-3-(alkyloxy)benzene derivatives, at lambda = 254 nm in acidic media, yields benzocyclobutenes, 3-alkylphenols, 3-alkylanisols, and 4-alkyl-1,2-dialkyloxybenzenes depending on the substitution pattern of the aromatic ring and the olefinic side chain. The final products are derived from an intramolecular [2 + 2] photocycloaddition and acidic rearrangements from a common intermediate.