nickel-catalyzed cross-electrophile coupling of benzyl alcohols with aromatic bromides has been developed. This deoxygenative cross-coupling occurs under mild reaction conditions at ambient temperature affording diarylmethanes, or 1,3-diarylpropenes from benzyl allyl alcohols. The system demonstrated good chemoselectivity tolerating an assortment of reactive functional groups.
Diarylmethanes through an Unprecedented Palladium-Catalyzed C−C Cross-Coupling of 1-(Aryl)methoxy-1 <i>H</i>-Benzotriazoles with Arylboronic Acids
作者:Manish K. Singh、Mahesh K. Lakshman
DOI:10.1002/cctc.201500818
日期:2015.12
1‐(Aryl)methoxy‐1H‐benzotriazoles (ArCH2OBt) are bench‐stable reagents that are prepared readily from 1H‐benzotriazol‐1‐yl‐4‐methylbenzenesulfonate and benzylic alcohols. These compounds, which contain a N−O−C bond, undergo cross‐coupling with arylboronic acids by C−O bond scission with catalysts that comprise Pd(OAc)2 and biarylphosphine ligands. Such reactivity of ArCH2OBt derivatives, which lead
Dynamic Kinetic Cross-Electrophile Arylation of Benzyl Alcohols by Nickel Catalysis
作者:Peng Guo、Ke Wang、Wen-Jie Jin、Hao Xie、Liangliang Qi、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1021/jacs.0c12462
日期:2021.1.13
Catalytic transformation of alcohols via metal-catalyzed cross-coupling reactions is very important, but it typically relies on a multistep procedure. We here report a dynamic kinetic cross-coupling approach for the direct functionalization of alcohols. The feasibility of this strategy is demonstrated by a nickel-catalyzed cross-electrophile arylation reaction of benzylalcohols with (hetero)aryl electrophiles
A one-potsynthesis of diarylmethanes from air-stable diborylmethane via the Suzuki–Miyaura cross-coupling reaction is described. The present approach realizes the synthesis of various symmetrical and unsymmetrical diarylmethanes in good to excellent yields.
Three benzyltitaniumcompounds of (ArCH2)Ti(O-i-Pr)3 (Ar = Ph (1a), 4-MeOC6H4 (1b), 4-FC6H4 (1c)) were prepared and used as benzyl nucleophiles for coupling reactions with aromatic or heteroaromatic bromides. The simple catalytic system of 1 mol % Pd(OAc)2 and 2 mol % PCy3 worked efficiently for a wide variety of aromatic bromides, producing diarylmethanes in good to excellent yields of up to 96%.
三种benzyltitanium的(ARCH化合物2)的Ti(O-我-Pr)3(Ar为Ph(上1A),4- MeOC 6 H ^ 4(1B),4-FC 6 H ^ 4(1C制备))中并用作苄基亲核试剂,用于与芳族或杂芳族溴化物偶联反应。1 mol%Pd(OAc)2和2 mol%PCy 3的简单催化系统可以有效地用于各种芳族溴化物,以高达96%的优异收率生产二芳基甲烷。受阻芳族溴化物或含有吸电子取代基的芳族溴化物的偶联反应在3-6小时的较长反应时间内较慢。溴吡啶,溴呋喃或溴噻吩的杂芳族溴化物与1a或1b的苄基试剂反应需要更长的反应时间12–24 h或更高的反应温度80°C,从而产生吡啶基,呋喃基和噻吩基-芳基甲烷中等产量。