Cross-Coupling of Phenol Derivatives with Umpolung Aldehydes Catalyzed by Nickel
作者:Leiyang Lv、Dianhu Zhu、Jianting Tang、Zihang Qiu、Chen-Chen Li、Jian Gao、Chao-Jun Li
DOI:10.1021/acscatal.8b01224
日期:2018.5.4
cross-coupling to construct the C(sp2)–C(sp3) bond was developed from two sustainable biomass-based feedstocks: phenolderivatives with umpolung aldehydes. This strategy features the in situ generation of moisture/air-stable hydrazones from naturally abundant aldehydes, which act as alkyl nucleophiles under catalysis to couple with readily available phenolderivatives. The avoidance of using both halides
possibility of construction of C–C bond via C–N and C–O cleavage. A number of reactions between benzyl ammoniums and vinyl acetates, aryl ammoniums and vinyl acetates, and benzyl ammoniums and aryl C–O electrophiles have been studied. We also disclosed that benzyl ammonium salts can be activated by low-valent nickel to be radicals. 1 Introduction 2 Cross-Coupling of C–N and C–O Electrophiles 3 Summary
Synthesis of 2‐Benzyl‐3,4‐dihydronaphthalenes via Oxidative Radical Opening/Cyclization of Methylenecyclopropanes with Potassium Benzyltrifluoroborates
Here reports a copper-catalyzed approach for the synthesis of 2-benzyl-3,4-dihydronaphthalenes. The reaction was proposed to proceed by a sequence of radical addition, ring-opening, and cyclization of methylenecyclopropanes with potassium benzyltrifluoroborate. Such a method features operational simplicity, mild reaction conditions and widely functional group tolerance and accords a diverse array of
Palladium on Charcoal plus Enantiopure Amino Alcohols as Catalytic Systems for the Enantioselective 1,4-Reduction of α-Substituted α,β-Unsaturated Ketones