将二氟亚甲基引入有机分子中因其对化合物的理化和生物学性质的深远影响而引起了人们的广泛关注。尽管如此,从现成的原料化学品中获取二氟烷烃的现有方法仍然有限。在这项研究中,我们提出了一种高效、模块化的方案,用于从烯烃合成二氟化化合物,采用易于获得的试剂 ClCF 2 SO 2 Na 作为通用的“二氟亚甲基”关键。通过有机光氧化还原催化烯烃的氢氯二氟甲基化,然后进行连接硼基自由基促进的卤素原子转移(XAT)过程,我们成功获得了各种二氟化合物,包括偕二氟烷烃、偕二氟烯烃、二氟甲基烷烃和二氟甲基烯烃,具有令人满意的产量。通过成功制备复杂药物和天然产物的CF 2连接衍生物,证明了这一关键策略的实用性。该方法为结构多样的二氟化烃的合成开辟了新途径,并突出了连接的硼基自由基在有机氟化学中的效用。
A silver‐mediated oxidative difluoromethylation of styrenes and vinyl trifluoroborates with TMSCF2H is reported for the first time. This method enables direct and facile access to CF2H‐alkenes from abundant alkenes with excellent functional‐group compatibility. Moreover, this Ag/TMSCF2H protocol could further enable a series of radical difluoromethylation reactions of a wide array of substrates, offering
Copper-Mediated Difluoromethylation of Aryl and Vinyl Iodides
作者:Patrick S. Fier、John F. Hartwig
DOI:10.1021/ja301013h
日期:2012.3.28
straightforward method for the cross-coupling of aryl and vinyliodides with a difluoromethyl group generated from readily available reagents to form difluoromethylarenes and difluoromethyl-substituted alkenes. The reaction of electron-neutral, electron-rich, and sterically hindered aryl and vinyliodides with the combination of CuI, CsF and TMSCF(2)H leads to the formation of difluoromethyl-substituted
The study of transition-metal difluorocarbene complex has long been a subject of active investigation, but the transition-metal-catalyzed transfer of difluorocarbene remains a significant challenge. The Pd-catalyzed transfer of difluorocarbene is described to realize the coupling reaction of boronic acids with difluorocarbene to give (difluoromethyl)arenes and -olefins. Mechanistic investigations reveal
[EN] DIFLUOROMETHYLATION OF ARYL AND VINYL IODIDES<br/>[FR] DIFLUOROMÉTHYLATION D'IODURES D'ARYLE ET DE VINYLE
申请人:UNIV CALIFORNIA
公开号:WO2013134296A1
公开(公告)日:2013-09-12
Selectively fluorinated molecules are important as materials, pharmaceuticals, and agrochemicals, but their synthesis by simple, mild, laboratory methods is challenging. We report a straightforward method for the cross-coupling of a difluoromethyl group with readily available reagents to form difluoromethylarenes. The reaction of electron-neutral, electronrich, and sterically hindered aryl and vinyl iodides with the combination of Cul, CsF and TMSCF2H leads to the formation of difluoromethylarenes in high yield with good functional group compatibility. This transformation is surprising, in part, because of the prior observation of the instability of CuCF2H.
Selectively fluorinated molecules are important as materials, pharmaceuticals, and agrochemicals, but their synthesis by simple, mild, laboratory methods is challenging. We report a straightforward method for the cross-coupling of a difluoromethyl group with readily available reagents to form difluoromethylarenes. The reaction of electron-neutral, electronrich, and sterically hindered aryl and vinyl iodides with the combination of Cul, CsF and TMSCF
2
H leads to the formation of difluoromethylarenes in high yield with good functional group compatibility. This transformation is surprising, in part, because of the prior observation of the instability of CuCF
2
H.