取决于底物的性质,乙烯基环氧化物和苯乙烯氧化物可以通过排他性和非对映选择性的方式,通过专有的S N 2硼甲基化/开环与甲基二硼化锂盐反应。开环方案提供了高烯丙基硼酸酯,可以将其转化为具有挑战性的非对映体双烯丙基烯丙基脂环式1,3-二醇。通过硼甲基化/ 2-甲基-2-乙烯基环氧乙烷的开环,然后进行分子内环化,制备了史无前例的3-硼化的1,2-氧杂硼烷-2-醇产品。
I<sub>2</sub>-TBHP-catalyzed one-pot highly efficient synthesis of 4,3-fused 1,2,4-triazoles from N-tosylhydrazones and aromatic N-heterocycles via intermolecular formal 1,3-dipolar cycloaddition
I2-TBHP-catalyzed azomethine imine generation and subsequent regioselective 1,3-dipolarcycloaddition (DC) with aromatic N-heterocycles was developed to afford various 4,3-fused 1,2,4-triazoles in excellent yields. The method is operationally simple and highly efficient with broad functional group tolerance.
Copper(I)-Catalyzed Alkylation of Polyfluoroarenes through Direct CH Bond Functionalization
作者:Shuai Xu、Guojiao Wu、Fei Ye、Xi Wang、Huan Li、Xia Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201412450
日期:2015.4.7
The copper(I)‐catalyzed alkylation of electron‐deficient polyfluoroarenes with N‐tosylhydrazones and diazo compounds has been developed. This reaction uses readily available starting materials and is operationally simple, thus representing a practical method for the construction of C(sp2)C(sp3) bonds with polyfluoroarenesthroughdirectCHbondfunctionalization. Mechanistically, copper(I) carbene
C(sp)–C(sp<sup>3</sup>) Bond Formation through Cu-Catalyzed Cross-Coupling of<i>N</i>-Tosylhydrazones and Trialkylsilylethynes
作者:Fei Ye、Xiaoshen Ma、Qing Xiao、Huan Li、Yan Zhang、Jianbo Wang
DOI:10.1021/ja3004792
日期:2012.4.4
Copper-catalyzed cross-coupling of N-tosylhydrazones with trialkylsilylethynes leads to the formation of C(sp)-C(sp(3)) bonds. Cu carbene migratory insertion is proposed to play the key role in this transformation.
Organosilicon compounds have been extensively utilized both in industry and academia. Studies on the syntheses of diverse organosilanes is highly appealing. Through‐space metal/hydrogen shifts allow functionalization of C−H bonds at a remote site, which are otherwise difficult to achieve. However, until now, an aryl to alkyl 1,5‐palladium migration process seems to have not been presented. Reported
An efficient Cs2CO3‐promoted synthesis of α‐amino ketones using hydrazines, aldehydes, and α‐haloketones as starting materials through a cascade condensation/nucleophilic substitution/NNbondcleavage route is developed. The carbonyl group plays a key role in this novel NNbondcleavage process.
通过级联缩合/亲核取代/ NN键裂解途径,以肼,醛和α-卤代酮为起始原料,开发了一种高效的Cs 2 CO 3促进的α-氨基酮合成方法。羰基在这种新颖的NN键裂解过程中起关键作用。