已经发现,在5mol%的碘化亚铜(I)存在下,格氏试剂可将磺酰基活化的sp 3碳-氮键裂解。重要的是,广泛的磺酰基活化的苄基,烯丙基和炔丙基胺与格利雅试剂进行平滑的交叉偶联反应,从而提供结构多样的偶联产物,收率高至优异,并具有较高的化学,区域和立体选择性。此外,已经证明S N 2机理参与交叉偶联反应,该交叉偶联反应允许由旋光的α-支化胺衍生物不对称地合成手性烃。
A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO<sub>3</sub>H functionalized ionic liquids
作者:S. H. Shinde、C. V. Rode
DOI:10.1039/c7gc01654a
日期:——
respective ionic liquids. Among the several preapered ionic liquids, strong acidic imidazolium based butylsulfonic acid (6) showed the best activity with a maximum of 84% yield of condensation product. This strategy offers significantly highyield production of condensation products of furan and furfural as compared to the traditional mineral acid route. The activity and stability of the -SO3H functionalized
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
AsCat and FurCat: new Pd catalysts for selective room-temperature Stille cross-couplings of benzyl chlorides with organostannanes
作者:Thomas O. Ronson、Jonathan R. Carney、Adrian C. Whitwood、Richard J. K. Taylor、Ian J. S. Fairlamb
DOI:10.1039/c4cc09810b
日期:——
Two novel succinimide-based palladium complexes, AsCat and FurCat, are highly efficient catalysts for room-temperature Stille cross-coupling of organostannanes with benzyl chlorides.
A general and efficient synthesis of substituted furans and dihydrofurans via gold-catalyzed cyclization of (Z)-2-en-4-yn-1-ols
作者:Xiangwei Du、Feijie Song、Yuhua Lu、Haoyi Chen、Yuanhong Liu
DOI:10.1016/j.tet.2008.11.109
日期:2009.2
A highlyefficient Au-catalyzed cyclization of (Z)-enynols that proceeds under mild reaction conditions has been developed. This methodology provides rapid access to substituted furans and stereodefined (Z)-5-ylidene-2,5-dihydrofurans in a regioselective manner from suitably substituted (Z)-2-en-4-yn-1-ols.
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。