A free radical‐initiated methylation and/or α‐chloro‐β‐methylation of N‐arylacrylamides with dimethyl sulfoxide under the analogous Fenton reaction condition has been developed, which provides an effective and facile cascade strategy for the synthesis of oxindoles and chlorinated amides.
Iron-Mediated Azidomethylation or Azidotrideuteromethylation of Active Alkenes with Azidotrimethylsilane and Dimethyl Sulfoxide
作者:Rui Zhang、Haifei Yu、Zejiang Li、Qinqin Yan、Pan Li、Jilai Wu、Jing Qi、Menglu Jiang、Lixian Sun
DOI:10.1002/adsc.201800078
日期:2018.4.3
A radical azidomethylation of various alkenes with azidotrimethylsilane and dimethylsulfoxide has been achieved under mild reaction conditions, and the method efficiently introduces common and valuable azide and methyl groups into organic compounds. It offers a convenient method for preparing organic azides, which can be easily transformed into related amine derivatives and N‐heterocycles. Control
A photoredox 1,1-dichloromethylation of alkenes with the readily available bulk chemical chloroform was described, furnishing a variety of 1,1-dichloroalkane products selectively. Furthermore, this transformation could proceed smoothly on gram-scale, and the obtained products could transform into diverse γ-lactam derivatives with simple treatment. Mechanistically, the single electron transfer (SET)
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
The Effect of the Leaving Group in N-Heterocyclic Carbene-Catalyzed Nucleophilic Aromatic Substitution Reactions
We report here that the reactivity order of the leavinggroup is F > Cl ≥ Br > I in N-heterocyclic carbene-catalyzed CSNAr reactions of aryl halides bearing an α,β-unsaturated amide. Based on a qua...