Novel 1-[(heterocyclyl)alkyl]-4-diarylmethoxy piperidine derivatives are disclosed having the formula ##STR1## where n is 2-6, Ar.sup.1 and Ar.sup.2 are aryl and B is a substituted benzimidazolyl radical. These compounds are useful for their antianaphylactic and antihistaminic properties. Specific claimed compounds are 1-{3-[4-(diphenylmethoxy)-1-piperidinyl]-propyl}-1,3-dihydro-2H-benzimidaz ol-2-one, 1-{2-[4-(diphenylmethoxy)-1-piperidinyl]ethyl}1-, 3-dihydro-2H-benzimidazol-2-one, and 1-{4-[4-(diphenylmethoxy)-1-piperidinyl]butyl}-1,3-dihydro-2H-benzimidazol -2-one.
A general palladium-catalyzed cross-coupling of aryl fluorides and organotitanium (IV) reagents
作者:Xiao-Yun He
DOI:10.1007/s00706-021-02796-6
日期:2021.7
Pd(OAc)2/1-[2-(di-tert-butylphosphanyl)phenyl]-4-methoxy-piperidine was demonstrated to effectively catalyze cross-coupling of aryl fluoride and aryl(alkyl) titanium reagent. Both electron-deficient and electron-rich aryl fluoride can react effectively with nucleophile and provide extensive functional groups tolerance. 2-Arylated product was realized by selective activation of the C–F bond. Graphic
Phthalide synthesis through dehydrogenated lactonization of the C(sp<sup>3</sup>)–H bond by photoredox catalysis
作者:Hui Liu、Chao Liu、Shanyi Chen、Qihong Lai、Yulin Lin、Zhixiong Cai、Mingqiang Huang、Shunyou Cai
DOI:10.1039/d1gc02297k
日期:——
A practical and efficient method is established for the direct oxidative lactonization of the C(sp3)–H bonds relying on visible-light-induced photoredoxcatalysis. This protocol expediently allows the delivery of diverse phthalides using oxygen as the sole terminal oxidant under metal-free conditions at room temperature. Notably, the choice of an appropriate hydrogen atom transfer (HAT) cocatalyst
Cobalt-Catalyzed Biaryl Couplings via C–F Bond Activation in the Absence of Phosphine or NHC Ligands
作者:Juan Wei、Kun-Ming Liu、Xin-Fang Duan
DOI:10.1021/acs.joc.6b02354
日期:2017.2.3
Co-catalyzed biaryl coupling through C–F cleavage under phosphine or NHC-free conditions was described. A broad range of aryl fluorides including unactivated fluorides as well as those with sensitive functionalities could couple with various Ti(OEt)4-mediated aryl Grignard reagents with high selectivity under the catalysis of CoCl2/DMPU. Importantly, selective C–F bond activationcouplings between two types
Continuous flow synthesis of diaryl ketones by coupling of aryl Grignard reagents with acyl chlorides under mild conditions in the ecofriendly solvent 2-methyltetrahydrofuran
作者:Chuan-Tao Zhang、Rui Zhu、Zheng Wang、Bing Ma、Adrian Zajac、Marcin Smiglak、Chun-Nian Xia、Steven L. Castle、Wen-Long Wang
DOI:10.1039/c8ra07447j
日期:——
efficient continuous flow sequential synthesis of diaryl ketones was achieved by coupling of aryl Grignard reagents with acyl chlorides in the bio-derived “green” solvent 2-methyltetrahydrofuran (2-MeTHF) undermild reaction conditions (ambient temperature, 1 hour), allowing a safe and on-demand generation of 2-(3-benzoylphenyl)propionitrile with a productivity of 3.16 g hour−1.