A One-Pot Reaction of α-Imino Rhodium Carbenoids and Halohydrins: Access to 2,6-Substituted Dihydro-2<i>H</i>-1,4-oxazines
作者:Kieran D. Jones、Michael J. Nutt、Elena Comninos、Alexandre N. Sobolev、Stephen A. Moggach、Tomoya Miura、Masahiro Murakami、Scott G. Stewart
DOI:10.1021/acs.orglett.0c00947
日期:2020.5.1
a Rh(II)-catalyzed reaction between 1-tosyl-1,2,3-triazoles and halohydrins to provide 2,6-substituted 3,4-dihydro-2H-1,4-oxazines under basic conditions. The reaction is proposed to undergo a rhodiumcarbenoid 1,3-insertion into O-H followed by an annulation. The scope includes phenyl or alkenyl C4-substituted triazoles and a range of halohydrins using catalytic Rh2Oct4 and K2CO3. A synthesis of the
Deoxygenative C2-heteroarylation of quinoline <i>N</i>-oxides: facile access to α-triazolylquinolines
作者:Geetanjali S Sontakke、Rahul K Shukla、Chandra M R Volla
DOI:10.3762/bjoc.17.42
日期:——
A metal- and additive-free, highly efficient, step-economical deoxygenative C2-heteroarylation of quinolines and isoquinolines was achieved from readily available N-oxides and N-sulfonyl-1,2,3-triazoles. A variety of α-triazolylquinoline derivatives were synthesized with good regioselectivity and in excellent yields under mild reaction conditions. Further, a gram-scale and one-pot synthesis illustrated
Access to (<i>Z</i>)-β-Substituted Enamides from <i>N</i>1-H-1,2,3-Triazoles
作者:Tao Wang、Zongyuan Tang、Han Luo、Yi Tian、Mingchuan Xu、Qixing Lu、Baosheng Li
DOI:10.1021/acs.orglett.1c02087
日期:2021.8.20
A direct ring-opening/nucleophilic substitution reaction of N1-H-1,2,3-triazoles has been described. Divergent (Z)-β-halogen- or sulfonyl-substituted enamides could be stereospecifically synthesized in a tunable manner. This strategy might not only enable a new ring-opening method of N1-H-1,2,3-triazoles under nonmetal catalysis and mild reaction conditions but also offer a good opportunity to reliably
已经描述了N 1-H-1,2,3-三唑的直接开环/亲核取代反应。发散的 ( Z )-β-卤素或磺酰基取代的烯酰胺可以以可调的方式立体定向合成。这种策略不仅可以在非金属催化和温和的反应条件下实现N 1-H-1,2,3-三唑的新开环方法,而且还为可靠地获得多功能 ( Z )-β-取代的烯酰胺提供了良好的机会可用作进一步合成转化的合成前体。
Sequential Functionalization of the OH and C(<i>sp</i><sup>2</sup>)O Bonds of Tropolones by Alkynes and<i>N</i>-Sulfonyl Azides
作者:Boram Seo、Woo Hyung Jeon、Chul-Eui Kim、Sanghyuck Kim、Sung Hong Kim、Phil Ho Lee
DOI:10.1002/adsc.201500829
日期:2016.3.31
Sequentialcopper‐catalyzed [3+2] cycloaddition, rhodium‐catalyzed OH insertion, intramolecular 1,8‐addition, and rearrangement starting from 1‐alkynes, N‐sulfonyl azides, and tropolones is demonstrated for the synthesis of the 2‐functionalized aminotropones in one pot. These results indicate that sequential functionalization of OH and C(sp2)O bonds smoothly occurs in the C(sp2)OH bonds of tropolone
Rhodium-Catalyzed Denitrogenative [2,3] Sigmatropic Rearrangement: An Efficient Entry to Sulfur-Containing Quaternary Centers
作者:Dongari Yadagiri、Pazhamalai Anbarasan
DOI:10.1002/chem.201302653
日期:2013.11.4
blocks: α‐Sulfenylated imines containing a quaternary center, an ubiquitous subunit and excellent building block, were achieved by rhodium‐catalyzed denitrogenative [2,3] sigmatropic rearrangements of N‐sulfonyl‐1,2,3‐triazoles with allylaryl(alkyl) sulfides. Coupling of this methodology with a copper‐catalyzed cycloaddition reaction provides a platform for the direct regioselective functionalization of