Synthesis of Piperidine Derivatives by Rhodium- Catalyzed Tandem Reaction of<i>N</i>-Sulfonyl-1,2,3-Triazole and Vinyl Ether
作者:Sisi Yu、Yuehui An、Wenlin Wang、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1002/adsc.201800191
日期:2018.6.5
A chemoselective tandemreaction of 4‐acyloxymethylene‐1‐sulfonyl‐1,2,3‐triazole and vinyl ether was reported, producing polysubstituted piperidinederivatives in up to 96% yield. The key intermediate N‐sulfonyl 1‐azadiene generated by migration of the OAc group to the α‐imino rhodium carbene was isolated and a plausible mechanism was proposed. Several related ring systems were constructed from the
Rh(II)‐Catalyzed Denitrogenative Reaction of 1,2,3‐Triazolyl Esters with Indoles or Arenes: Efficient Synthesis of Homotryptamines or Allylamines
作者:Kuntal Pal、Geetanjali S. Sontakke、Chandra M. R. Volla
DOI:10.1002/adsc.202000632
日期:2020.9.8
efficient strategy for the synthesis of structurally diverse homotryptamines and allyl amines via a Rh(II)‐catalyzed tandem reaction of 1,2,3‐triazolyl esters with either indoles or 1,3,5‐trimethoxybenzene has been developed. The reaction proceeds via Rh(II)‐catalyzed intramolecular rearrangement of triazoles into 1‐azadienes followed by regioselective nucleophilic addition. The efficiency of the current
Synthesis of Pyrido[2,3‐
<i>b</i>
]indole Derivatives via Rhodium‐Catalyzed Cyclization of Indoles and 1‐Sulfonyl‐1,2,3‐triazoles
作者:Shengguo Duan、Yuehui An、Bing Xue、Yidian Chen、Wan Zhang、Ze‐Feng Xu、Chuan‐Ying Li
DOI:10.1002/adsc.201901599
日期:2020.4.27
Acyloxy‐substituted α,β‐unsaturated imines generated in situ from triazoles can act as aza‐[4 C] synthons and be trapped by indoles in a stepwise [4 + 2] cycloaddition reaction, thus providing rapid access to valuable pyrido[2,3‐b]indoles in high yields. Attractive features of this reaction system include operational simplicity, readily available substrates, construction of sterically demanding quaternary
由三唑原位生成的酰氧基取代的α,β-不饱和亚胺可以作为aza- [4 C]合成子,并被吲哚在逐步[4 + 2]环加成反应中捕获,从而提供了快速获取有价值的吡啶基[2, 3‐ b ]吲哚高产。该反应系统的吸引人的特征包括操作简便,易于获得的底物,空间要求严格的四元中心的构建以及使用三氟甲磺酸酯的便捷衍生作用。
Photoinduced Diverse Reactivity of Diazo Compounds with Nitrosoarenes
作者:Sourav Roy、Gourav Kumar、Indranil Chatterjee
DOI:10.1021/acs.orglett.1c02279
日期:2021.9.3
A diverse reactivity of diazo compounds with nitrosoarene in an oxygen-transfer process and a formal [2 + 2] cycloaddition is reported. Nitosoarene has been exploited as a mild oxygen source to oxidize an in situ generated carbene intermediate under visible-light irradiation. UV-light-mediated in situ generated ketenes react with nitosoarenes to deliver oxazetidine derivatives. These operationally
A novel gold-catalyzed water-mediated carbene cascadereaction of propargyl diazoacetates has been developed. Mechanistic investigation indicates that this reaction is initiated by gold-catalyzed gold–carbene formation followed by an unprecedented 6-endo-dig carbocyclization with tethered alkyne through an oxonium ylide intermediate, terminated by a β-H elimination/protodeauration process to give the