The photochemicalreactions of 2-substituted N-(2-halogenoalkanoyl) derivatives 1 of anilines and 5 of cyclic amines are described. Under irradiation, 2-bromo-2-methylpropananilides 1a – e undergo exclusively dehydrobromination to give N-aryl-2-methylprop-2-enamides (=methacrylanilides) 3a – e (Scheme 1 and Table 1). On irradiation of N-alkyl- and N-phenyl-substituted 2-bromo-2-methylpropananilides
描述了苯胺的 2-取代的 N-(2-卤代烷酰基) 衍生物 1 和环胺的 5 的光化学反应。在辐照下,2-溴-2-甲基丙酰苯胺 1a – e 仅进行脱溴氢反应,得到 N-芳基-2-甲基丙酰苯胺(=甲基丙烯酰苯胺)3a – e(方案 1 和表 1)。在辐照 N-烷基和 N-苯基取代的 2-溴-2-甲基丙苯胺 1f – m 时,环化产物,即 1,3-二氢-2H-吲哚-2-酮 (=oxindoles) 2f – m 和 3 ,4-二氢喹啉-2(1H)-ones (=dihydrocarbostyrils) 4f – m, 除了 3f – m。另一方面,N-甲基取代的 2-氯-2-苯基乙酰苯胺 1o - q 和 2-氯乙酰苯胺 1r 的辐照产生了羟吲哚 2o - r 作为唯一的产物,但收率低(方案 3 和表 2)。相应的 N-苯基衍生物 1s - v 光环化为羟吲哚 2s - v 进行顺利。提出了形成光产物的合理机制(方案
Cu/Pd cooperatively catalyzed tandem intramolecular anti-Markovnikov hydroarylation of unsaturated amides: facile construction of 3,4-dihydroquinolinones <i>via</i> borylation/intramolecular C(sp<sup>3</sup>)–C(sp<sup>2</sup>) cross coupling
作者:Zhijie Kuang、Bingnan Li、Qiuling Song
DOI:10.1039/c7cc07180a
日期:——
An anti-Markovnikov hydroarylation of unsaturated amides via a Cu/Pd synergistically catalyzed cascade borylation/intramolecular sp2–sp3 cross coupling has been disclosed.
Synthesis of Cyclic Amidines by Iridium-Catalyzed Deoxygenative Reduction of Lactams and Tandem Reaction with Sulfonyl Azides
作者:Youliang He、Xiaoming Wang
DOI:10.1021/acs.orglett.0c03953
日期:2021.1.1
An efficient and convenient synthesis of various cyclic amidines has been achieved via iridium-catalyzed deoxygenative reduction of lactams with a silane followed by a one-pot cycloaddition reaction with sulfonyl azides. Using the novel tandem procedure, a large array of cyclic amidines bearing various sized rings were synthesized in good yields from readily available lactams. This methodology has
elusive substrates (e.g., an unactivatedolefin, 1-octene). Comprehensive mechanistic studies on the electronic effect, deuterium exchange, kinetic isotope effect, kinetic profile, and numerous Rh(III) complexes have established [RhCp*](2+) as the catalyst resting state, electrophilic C-H activation as the turnover-limiting step, and a five-membered rhodacycle as a catalytically competent intermediate.