Ireland-Claisen rearrangement of secondary allyl acetate revisited: inevitable C-silylation circumvented by one-pot application of excessive LDA/TMSCl and TBAF
摘要:
Yield lowering C-silylation was found to be inevitable in all the six tested examples of stoichiometric LDA/TMSCl promoted Ireland-Claisen rearrangement of secondary allyl acetates. In order to circumvent this problem, a higher yielding protocol was devised after the isolated by-products were found to be excellent substrates for further rearrangement. Thus, excessive LDA/TMSCl was applied to achieve complete 3,3'-sigmatropic shift of the substrates, and the resulting mixtures of normal and alpha-silylated gamma,delta-unsaturated carboxylic acids was then desilylated by one-pot application of TBAF. (c) 2012 Elsevier Ltd. All rights reserved.
Mechanism of Visible Light-Mediated Alkene Aminoarylation with Arylsulfonylacetamides
作者:Anthony R. Allen、Jia-Fei Poon、Rory C. McAtee、Nicholas B. Watson、Derek A. Pratt、Corey R.J. Stephenson
DOI:10.1021/acscatal.2c02577
日期:2022.7.15
Alkene aminoarylation with arylsulfonylacetamides via a visiblelight-mediated radical Smiles–Truce rearrangement represents a convenient approach to the privileged arylethylamine pharmacophore traditionally generated by circuitous, multistep sequences. Herein, we report detailed synthetic, spectroscopic, kinetic, and computational studies designed to interrogate the proposed mechanism, including the
Enantioselective C3‐Allylation of Pyridines via Tandem Borane and Palladium Catalysis
作者:Jun‐Jie Tian、Rui‐Rui Li、Gui‐Xiu Tian、Xiao‐Chen Wang
DOI:10.1002/anie.202307697
日期:2023.8.21
A one-pot, three-step method for highly enantioselective C3-allylation reactions of pyridines was developed. The method involved borane-catalyzed dearomative pyridine hydroboration, palladium-catalyzed enantioselective allylation of the dearomatized intermediate, and finally oxidation by air. The method was applicable to a broad range of pyridines, N-heteroarenes, and allylic esters.