首次报道,单电子氧化剂(例如CAN或K 2 S 2 O 8)通过简单的作用影响简单的宝石-二氟环丙烷的开环,从而通过该作用提供了高收率的1,3-二溴-2,2-二氟丙烷。在通过引入第一个溴原子开始反应后,以区域特异性的方式,适当地选择条件允许在位置上不仅允许在第二氟丙烷结构中并入第二卤原子,而且可以在二氟丙烷结构的C 1位上掺入羟基或乙酰氨基基团。 C 3位置。
Conversion between Difluorocarbene and Difluoromethylene Ylide
作者:Jian Zheng、Jin-Hong Lin、Ji Cai、Ji-Chang Xiao
DOI:10.1002/chem.201303248
日期:2013.11.4
The interconversion between difluoromethylene ylide and difluorocarbene is described. The difluoromethylene ylideprecursor, Ph3P+CF2CO2−, could be turned into an efficient difluorocarbene reagent, whereas the classical difluorocarbene reagents, HCF2Cl and FSO2CF2CO2TMS, could generate highly reactive difluoromethylene ylide. Thus the Wittig difluoro‐olefination and difluorocyclopropanation could be
描述了二氟亚甲基叶立德和二氟卡宾之间的相互转化。该二氟亚甲基叶立德前体中,Ph 3 P + CF 2 CO 2 - ,也可以变成一个高效的二氟卡宾的试剂,而经典二氟卡宾的试剂,HCF 2 Cl和FSO 2 CF 2 CO 2 TMS,可能会产生高反应性的二氟亚甲基内鎓盐。因此,使用相同的试剂可以选择性地实现Wittig的二氟烯烃化和二氟环丙烷化。另外,从不同卡宾来源获得的叶立德在维蒂希反应中显示出不同的反应性。
Pd-Catalyzed Regioselective Activation of<i>gem</i>-Difluorinated Cyclopropanes: A Highly Efficient Approach to 2-Fluorinated Allylic Scaffolds
作者:Jun Xu、Ebrahim-Alkhalil Ahmed、Bin Xiao、Qian-Qian Lu、Yun-Long Wang、Chu-Guo Yu、Yao Fu
DOI:10.1002/anie.201502308
日期:2015.7.6
An unprecedented Pd‐catalyzedregioselective activation of gem‐difluorinated cyclopropanes induced by CC bond cleavage is reported. It provides a general and efficient access to a variety of 2‐fluoroallylic amines, ethers, esters, and alkylation products in high Z‐selectivity, which are important skeletons in many biologically active molecules. In addition, the transformation represents the first
Palladium-catalyzed allylic alkylation dearomatization of β-naphthols and indoles with <i>gem</i>-difluorinated cyclopropanes
作者:Zhiyuan Fu、Jianping Zhu、Songjin Guo、Aijun Lin
DOI:10.1039/d0cc07529a
日期:——
route to access 2-fluoroallylic β-naphthalenones and indolenines bearing quaternary carbon centers in good yields with high Z-selectivity via C–C bond activation, C–F bond cleavage and the dearomatization process, benefiting from the wide substrate scope and good functional group tolerance. Moreover, 2-fluoroallylic furanoindoline and pyrroloindolines were achieved in good efficiency via cascade allylic
A strategically novel protocol for ring-opening functionalization of aryl gem-difluorocyclopropanes (F2CPs), which allows an expedient construction of CF3-containing architectures via visible-light-promoted F-nucleophilic attack manifold, was disclosed. Single electron oxidation of F2CPs was ascribed as the critical step for the success of this transformation by prompting F-nucleophilic attack, as