报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。
报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。
Ir(I)‐Catalyzed C−H Glycosylation for Synthesis of 2‐Indolyl‐
<i>C</i>
‐Deoxyglycosides
作者:Changyue Yu、Yichu Liu、Xiong Xie、Shulei Hu、Shurui Zhang、Mingjie Zeng、Dan Zhang、Jiang Wang、Hong Liu
DOI:10.1002/adsc.202100855
日期:2021.11.9
we present an efficient, regioselective, stereoselective and widely applicable strategy for the synthesis of 2-indolyl-C-deoxyglycosides via Ir(I)-catalyzed, pyridine-group-directed C−H functionalization. This method exhibits high tolerance for the functional groups of indoles and the protecting groups of carbohydrates. Moreover, this protocol has good stereoselectivity and mainly produces β-configuration
Cp*Co(III)-catalysed selective alkylation of directed C–H bonds of arenes and heteroarenes has been accomplished employing donor–acceptor carbenes, derived from α-diazocarbonyl compounds. The developed method allows ready access to various substituted α-(hetero)aryl-α-arylacetic acid derivatives in good to excellent yields. Synthetic utility was also shown through the synthesis of a substituted indole
C-alkyl-glycosides. The anomerization reaction plausibly proceeds through the pathway involving the activation of the C(sp3)–H bond mediated by the iridium catalyst and reversible hydrogen transfer, rather than the classical anomerization mechanismsinvolving the endocyclic cleavage of the C1–O5 bond or exocyclic cleavage of the glycosidic bond.
Transition-Metal-Free Synthesis of Fused Quinazolinones by Oxidative Cyclization of <i>N</i>-Pyridylindoles
作者:Alankrita Garia、Nidhi Jain
DOI:10.1021/acs.joc.9b01170
日期:2019.8.2
believed to proceed via an in situ generated 2-hydroxy-1-(pyridin-2-yl)indolin-3-one as the key reaction intermediate, which undergoes a C–C bond cleavage to produce an electrophilic C-3 site in N-pyridyl indole. Subsequent nucleophilic attack by pyridyl nitrogen results in its cyclization.
报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。