Rhenium(I)-Catalyzed Generation of α,β-Unsaturated Carbene Complex Intermediates from Propargyl Ethers for the Preparation of Cycloheptadiene Derivatives
作者:Hideyuki Sogo、Nobuharu Iwasawa
DOI:10.1002/anie.201604371
日期:2016.8.16
The rhenium(I)‐catalyzed generation of α,β‐unsaturated carbene complex intermediates from easily available propargyl ethers was achieved for the concise construction of cycloheptadiene derivativesthrough the formal [4+3] cycloaddition reaction with siloxydienes.
Chemoselective Synthesis of <i>Z</i>
-Olefins through Rh-Catalyzed Formate-Mediated 1,6-Reduction
作者:Raphael Dada、Zhongyu Wei、Ruohua Gui、Rylan J. Lundgren
DOI:10.1002/anie.201800361
日期:2018.4.3
Z‐olefins are important functional units in synthetic chemistry; their preparation has thus received considerable attention. Many prevailing methods for cis‐olefination are complicated by the presence of multiple unsaturated units or electrophilic functional groups. In this study, Z‐olefins are delivered through selective reduction of activated dienes using formic acid. The reaction proceeds with high
A General Catalyst for Site-Selective C(sp<sup>3</sup>)–H Bond Amination of Activated Secondary over Tertiary Alkyl C(sp<sup>3</sup>)–H Bonds
作者:Ryan J. Scamp、James G. Jirak、Nicholas S. Dolan、Ilia A. Guzei、Jennifer M. Schomaker
DOI:10.1021/acs.orglett.6b01392
日期:2016.6.17
catalyst-controlled and selective carbon–hydrogen (C–H) bond amination of activated secondary C–H bonds over tertiary alkylC(sp3)–H bonds is challenging, as substrate control often dominates when reactive nitrene intermediates are involved. In this letter, we report the design of a new silver complex, [(Py5Me2)AgOTf]2, that displays general and good-to-excellent selectivity for nitrene insertion into
Chromium/Photoredox Dual Catalyzed Synthesis of
<i>α</i>
‐Benzylic Alcohols, Isochromanones, 1,2‐Oxy Alcohols and 1,2‐Thio Alcohols
作者:Subhabrata Dutta、Johannes E. Erchinger、Felix Schäfers、Ankita Das、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.202212136
日期:2022.12.5
The synthesis of α-benzylic alcohols, functionalized isochromanones, 1,2-oxy alcohols and 1,2-thio alcohols has been successfully achieved by employing a dual catalytic method combining chromium chemistry and photoredox catalysis. This presents a methodology under mild conditions with high functional group tolerance.
halogen-atom transfer mechanism, which provides innovative and efficient access to various gem-difluorohomoallylic alcohols under mild conditions with broad substrate scope. Preliminary mechanistic experimental and computational studies demonstrate that this radical-to-polar crossover transformation could be achieved by sequentially orchestrated Lewis acid activation, halogen-atom transfer, radical addition