On the reactivity of naphthalene and biphenyl dianions: tying up loose ends concerning an S<sub>N</sub>
2-ET dichotomy in alkylation reactions
作者:Inmaculada Blasco、Henoc Pérez、Albert Guijarro
DOI:10.1002/poc.3423
日期:2015.6
Naphthalene and biphenyl dianions are interesting compounds that can be obtained by double reduction of the corresponding arenes in solution with certain alkali metals. These dianions are highly reactive and rather elusive species with very high laying and highly delocalized electrons. They share many aspects of the reactivity of the alkali metal they originated from and consequently behave primarily
Mechanochemically Generated Calcium‐Based Heavy Grignard Reagents and Their Application to Carbon–Carbon Bond‐Forming Reactions
作者:Pan Gao、Julong Jiang、Satoshi Maeda、Koji Kubota、Hajime Ito
DOI:10.1002/anie.202207118
日期:2022.10.10
technique, we have achieved for the first time the generation of calcium-based heavy Grignardreagents (Ar−CaX) from commercially available, unactivated calcium metal without applying any pre-activation process. Our operationally simple protocol enables the rapid development of novel cross-electrophile-coupling reactions mediated by arylcalcium nucleophiles under mechanochemical conditions.
Enantioselective cyanation of benzylic C–H bonds via copper-catalyzed radical relay
作者:Wen Zhang、Fei Wang、Scott D. McCann、Dinghai Wang、Pinhong Chen、Shannon S. Stahl、Guosheng Liu
DOI:10.1126/science.aaf7783
日期:2016.9.2
sp3-hybridized carbon–hydrogen [C(sp3)–H] bonds in complex organic molecules could facilitate much more efficient preparation of therapeutics and agrochemicals. Here, we report a copper-catalyzed radical relay pathway for enantioselective conversion of benzylic C–H bonds into benzylic nitriles. Hydrogen-atom abstraction affords an achiral benzylic radical that undergoes asymmetric C(sp3)–CN bond formation upon
AN EFFICIENT METHOD FOR CYCLOPROPANATION VIA APROTIC DIAZOTIZATION OF 3-(TRI-<i>n</i>-BUTYLSTANNYL)PROPYLAMINES
作者:Shuji Teratake、Shun-ichi Morikawa
DOI:10.1246/cl.1975.1333
日期:1975.12.5
2-lithio-3-(tri-n-butylstannyl)propionitrile (1) with alkyl halides or carbonyl compounds gave the corresponding 2-substituted 3-(tri-n-butylstannyl)propionitriles (2), which were reduced to amines (4) and then diazotized to give alkyl cyclopropanes or cyclopropanemethanols, respectively, in moderate overall yields.