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
Rhodium-Catalyzed Synthesis of 2,5-Epoxybenzo[<i>f</i>][1,4]oxazepines by Tandem Reaction of 1-Sulfonyl-1,2,3-triazoles and Salicylaldehydes
作者:Yinping Shi、Xing Yu、Chuan-Ying Li
DOI:10.1002/ejoc.201500912
日期:2015.9
Readily available 1-sulfonyl-1,2,3-triazoles were converted into α-imino carbenes in the presence of catalytic amounts of rhodium(II) salts. The carbenes underwent a tandemreaction with salicylaldehydes to provide a series of functionalized 2,5-epoxybenzo[f][1,4]oxazepines in high yields.
在催化量的铑 (II) 盐的存在下,容易获得的 1-磺酰基-1,2,3-三唑被转化为 α-亚氨基卡宾。卡宾与水杨醛发生串联反应,以高产率提供一系列功能化的 2,5-环氧苯并 [f][1,4] 氧氮杂。
Synthesis of β-Amino-α,β-unsaturated Ketone Derivatives via Sequential Rhodium-Catalyzed Sulfur Ylide Formation/Rearrangement
作者:Jun He、Zengming Man、Yinping Shi、Chuan-Ying Li
DOI:10.1021/acs.joc.5b00521
日期:2015.5.1
a Rh(II) catalyst and β-(methylthio)-α,β-unsaturated ketones, 1-sulfonyl-1,2,3-triazoles can be converted into functionalized β-amino-α,β-unsaturated ketones via formation of α-imino rhodium carbene/sulfur ylide and subsequent rearrangement. The products decompose to useful 2-methylthiopyrrole derivatives conveniently in high yield.
One-Pot Transannulation of <i>N</i>-Sulfonyl-1,2,3-triazoles to Dihydro-β-carbolines and Dihydroisoquinolines via Rhodium-Catalyzed C–H Insertion-cum-Base-Mediated Aza-Michael Reaction
作者:Shanmugam Rajasekar、Pazhamalai Anbarasan
DOI:10.1021/acs.joc.9b00644
日期:2019.6.21
3-triazoles with a Michael acceptor-tethered indolederivative have been achieved for the synthesis of dihydro-β-carboline derivatives. The present methodology involves an efficient rhodium-catalyzed insertion of azavinyl carbenes to C3–H bond of indole followed by base-mediated intramolecular aza-Michael reaction. The optimized conditions tolerate various functional groups and afford the diverse dihydro-β-carbolines
Facile synthesis of N2-substituted-1,2,3-triazole from aryl ethynylene and azide via a one-pot two-step strategy
作者:Cong Guan、Jian Ji、Zi Li、Qinghua Wei、Xiang Wu、Shunying Liu
DOI:10.1016/j.tet.2022.132670
日期:2022.2
An efficient one-pot two-step synthetic strategy to access highly selective N2-substituted-1,2,3-triazole from aryl ethynylenes, azides and furan has been developed via a radical transformation. 17 examples of aryl ethynylene with various substituents were converted into their corresponding functionalized N2-substituted-1,2,3-triazole derivatives in good yields.