Carbonylativecycloaddition of allyl tosylates and alkynes proceeded in the presence of palladium catalysts to afford a range of cyclopentenones. In the presence of methanol, five-component coupling reactions gave methyl cyclopentenyl acetates, whereas in the absence of methanol, (cyclopentenoylmethylidene)furanones were formed from six components. Allyl tosylate was found to be essential for these
It has been established that a cationic Rh(I)/dppf complex catalyzes the olefin isomerization/allyl Claisen rearrangement/intramolecular hydroacylation cascade of di(allyl) ethers to produce substituted cyclopentanones in good yields under mild conditions.
Palladium-catalyzed oxidative arylacetoxylation of alkenes: synthesis of indole and indoline derivatives
作者:Shuklachary Karnakanti、Zhong-Lin Zang、Sheng Zhao、Pan-Lin Shao、Ping Hu、Yun He
DOI:10.1039/c7cc06448a
日期:——
A method for oxidative arylacetoxylation of alkenes has been developed to synthesize indole and indoline derivatives from readily accessible substrates. The cinnamyl tethered anilines with picolinamide as a directing group provided 3-substituted indoles via intramolecular oxidative arylacetoxylation, and the 2-methyl substituted cinnamyl anilines furnished indoline derivatives with 3-position quaternary
<scp>Copper‐Catalyzed</scp>
Aerobic Oxidative Cleavage of Unstrained
<scp>Carbon‐Carbon</scp>
Bonds of 1,
<scp>1‐Disubstituted</scp>
Alkenes with Sulfonyl Hydrazides
carbon‐carbon bond cleavages have emerged as a powerful strategy to complement traditional ionic‐type transformations. However, carbon‐carbon cleavage reaction triggered by alkoxy radical intermediate derived from the combination of alkyl radical and dioxygen, is scarce and underdeveloped. Herein, we report alkoxy radical, which was generated from alkyl radical and dioxygen, mediated selective cleavage of unstrained
Geminal Bis(silyl) Enal: A Versatile Scaffold for Stereoselective Synthesizing C<sup>3</sup>,O<sup>1</sup>-Disilylated Allylic Alcohols Based upon Anion Relay Chemistry
作者:Linjie Yan、Xianwei Sun、Hongze, Li、Zhenlei Song、Zengjin, Liu
DOI:10.1021/ol400145z
日期:2013.3.1
Geminal bis(silyl) enal 2a is shown to be a useful scaffold for anion relay chemistry (ARC) aimed at the stereoselective synthesis of C3,O1-disilylated allylicalcohols. The ARC reaction is initiated by the addition of an alkyllithium to the aldehyde and features a CuCN-promoted Csp2-to-O 1,4-silyl migration to generate a vinylcuprate that reacts with activated electrophiles.