Mn(III)-Mediated Radical Cyclization of <i>o</i>-Alkenyl Aromatic Isocyanides with Boronic Acids: Access to N-Unprotected 2-Aryl-3-cyanoindoles
作者:Lu Liu、Lei Li、Xin Wang、Ran Sun、Ming-Dong Zhou、He Wang
DOI:10.1021/acs.orglett.1c01979
日期:2021.8.6
The synthesis of N-unprotected 2-aryl-3-cyanoindoles was realized via the Mn(III)-mediated radical cascade cyclization of o-alkenyl aromatic isocyanides with boronic acids. A possible mechanism involving a sequential intermolecular radical addition, intramolecular cyclization, and cleavage of the C–C bond under mild reaction conditions is proposed. Mechanism studies show that H2O or O2 might provide
N-未保护的 2-芳基-3-氰基吲哚的合成是通过 Mn(III) 介导的邻烯基芳族异氰化物与硼酸的自由基级联环化来实现的。提出了一种可能的机制,包括在温和的反应条件下连续分子间自由基加成、分子内环化和 C-C 键断裂。机理研究表明,H 2 O 或O 2可能为消除苯甲醛提供氧源。
Quinoxalino[2,3-<i>c</i>]cinnolines and Their 5-<i>N</i>-Oxide: Alkoxylation of Methyl-Substituted Quinoxalino[2,3-<i>c</i>]cinnolines to Acetals and Orthoesters
作者:Makhluf J. Haddadin、Mirna El-Khatib、Tharallah A. Shoker、Christine M. Beavers、Marilyn M. Olmstead、James C. Fettinger、Kelli M. Farber、Mark J. Kurth
DOI:10.1021/jo201687x
日期:2011.10.21
We report the alkoxylation of methyl-substitutedquinoxalino[2,3-c]cinnolines to give acetals and orthoesters in high yields. Routes to the precursors of this alkoxylation reaction as well as other quinoxalino[2,3-c]cinnoline and their 5-oxide derivatives are reported. Most of these quinoxalino[2,3-c]cinnolines were prepared by cyclization of the corresponding 2-amino-3-(2-nitrophenyl)quinoxaline,
我们报告甲基取代的喹喔啉[2,3- c ] cinnolines的烷氧基化以高收率得到乙缩醛和原酸酯。据报道,该烷氧基化反应的前体以及其他喹喔啉[2,3- c ] cinnoline及其5-氧化物衍生物的途径。这些喹喔啉[2,3- c ]喹啉中的大多数是通过相应的2-氨基-3-(2-硝基苯基)喹喔啉的环化反应制备的,这反过来又是苯并呋喃山氧化物加2-硝基苄基氰化物引起的异常贝鲁特反应的结果。 。提出了这些有趣反应的机械解释。
Baylis–Hillman acetates in organic synthesis: convenient one-pot synthesis of α-carboline framework – a concise synthesis of neocryptolepine
作者:Deevi Basavaiah、Daggula Mallikarjuna Reddy
DOI:10.1039/c2ob26339d
日期:——
A convenient, facile, and one-pot methodology for the synthesis of α-carbolines from Baylis–Hillman (BH) acetates, involving three steps (reactions), (1) mono alkylation of 2-nitroarylacetonitriles with BH-acetates, (2) reduction of nitro group into amino group using Fe/AcOH and (3) formation of two (five and six membered) rings, is presented. This methodology is successfully applied to the synthesis