A two carbon homologation of Friedel–Crafts alkylation enabled by photochemical alkene stitching: modular assembly of cyclolignans
作者:Shyamal Pramanik、Apurba Samanta、Soumitra Maity
DOI:10.1039/d4cc00957f
日期:——
efficient two-carbon homologated variant of Friedel–Crafts alkylation via photochemical radical alkene stitching. Readily available feedstock alkenes are used as bridges between photogenerated alkyl radicals and arenes, opening a route to γ-aryl-carbonyls for chemo-divergent access to aryltetralone and γ-lactones, a gateway to 2,7′-cyclolignans.
A general asymmetric copper-catalysed Sonogashira C(sp3)–C(sp) coupling
作者:Xiao-Yang Dong、Yu-Feng Zhang、Can-Liang Ma、Qiang-Shuai Gu、Fu-Li Wang、Zhong-Liang Li、Sheng-Peng Jiang、Xin-Yuan Liu
DOI:10.1038/s41557-019-0346-2
日期:2019.12
versatile reaction for the straightforward formation of C–C bonds, forging the carbon skeletons of broadly useful functionalized molecules. However, asymmetric Sonogashira coupling, particularly for C(sp3)–C(sp) bond formation, has remained largely unexplored. Here we demonstrate a general stereoconvergent Sonogashira C(sp3)–C(sp) cross-coupling of a broad range of terminal alkynes and racemic alkyl halides
light-mediated cyclization reaction initiated by an atomtransferradicaladdition (ATRA) of haloalkanes onto alkenes was exploited for the synthesis of functionalized dihydrobenzofurans. Initial investigation indicated that the dimeric gold catalyst [Au2(μ-dppm)2Cl2] can effectively be used for intermolecular ATRA reactions. Further, the reactivity was applied in a cascade-like cyclization for the preparation