Regioselective Iodoazidation of Alkynes: Synthesis of α,α-Diazidoketones
摘要:
Aryl alkyl alkynes reacted with N-iodosuccinimide (NIS) and trimethylsilyl azide (TMSN3), leading to α,α-diazidoketones via the regioselective addition of IN3 to alkynes. Huisgen cyclization of α,α-diazidoketones generated bis-triazole compounds.
Photosensitizer-Free Visible-Light-Mediated Gold-Catalyzed 1,2-Difunctionalization of Alkynes
作者:Long Huang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201511487
日期:2016.4.4
vinyl gold intermediate instead of the commonly used protodemetalation step. This step provides facile access to functionalized products in one‐pot processes. With a P,N‐bidentate ligand, a stable aryl gold(III) species was obtained, which constitutes the first direct experimental evidence for the commonly postulated direct oxidative addition of an aryl diazonium salt to a pyridine phosphine gold(I) complex
The efficient electrochemically promoted [3 + 2] annulation of imidazo[1,2-a]pyridines with alkynes using traceless electrons as green reagents has been developed, leading to the synthesis of a large class of polycyclic heteroaromatics in good yields with a broad substrate scope under mild and green conditions. The scaled-up experiment, follow-up procedures, and potential biological applications show
使用无痕电子作为绿色试剂,开发了咪唑并[1,2- a ]吡啶与炔烃的高效电化学促进[3 + 2]成环反应,从而可以在广泛的底物下以良好的产率合成一大类多环杂芳烃在温和和绿色条件下的范围。放大实验、后续程序和潜在的生物学应用表明了电化学方法的实用性和可行性。
Electrochemically-promoted synthesis of benzo[<i>b</i>]thiophene-1,1-dioxides <i>via</i> strained quaternary spirocyclization
We report an approach for the synthesis of benzothiophene motifs under electrochemical conditions by the reaction of sulfonhydrazides with internal alkynes. Upon the formation of a quaternary spirocyclization intermediate by the selective ipso-addition instead of an ortho-attack, the S-migration process was rationalized to lead to the products. Computational studies revealed the selectivity and the
Cu-Catalyzed Radical Cascade Annulations of Alkyne-Tethered <i>N</i>-Alkoxyamides with Air: Facile Access to Isoxazolidine/1,2-Oxazinane-Fused Isoquinolin-1(2<i>H</i>)-ones
作者:Fei Chen、Sheng-Qiang Lai、Fei-Fei Zhu、Qiang Meng、Yu Jiang、Wei Yu、Bing Han
DOI:10.1021/acscatal.8b02445
日期:2018.9.7
A series of structurally important isoxazolidine/1,2-oxazinane-fused isoquinolin-1(2H)-ones have been facilely synthesized via efficient Cu-catalyzed aerobic oxidative radical cascade annulations of alkyne-tethered N-alkoxyamides. This method features air as the environment-friendly oxidant and has the merits of a cheap catalyst, broad substrates scope, high atom economy, and simple operation.
Regioselective Iodoazidation of Alkynes: Synthesis of α,α-Diazidoketones
作者:Noriko Okamoto、Takuya Sueda、Hideki Minami、Yoshihisa Miwa、Reiko Yanada
DOI:10.1021/acs.orglett.5b00395
日期:2015.3.6
Aryl alkyl alkynes reacted with N-iodosuccinimide (NIS) and trimethylsilyl azide (TMSN3), leading to α,α-diazidoketones via the regioselective addition of IN3 to alkynes. Huisgen cyclization of α,α-diazidoketones generated bis-triazole compounds.