Generation of 3-(1H-pyrrol-3-yl)-1H-inden-1-ones via a tandem reaction of 1-(2-alkynylphenyl)-2-enone, 2-isocyanoacetate, and water
作者:Danqing Zheng、Shaoyu Li、Jie Wu
DOI:10.1039/c2cc34509a
日期:——
A silver triflate-catalyzed tandem reaction of 1-(2-alkynylphenyl)-2-enone, 2-isocyanoacetate, and water provides a novel and efficient route for the delivery of 3-(1H-pyrrol-3-yl)-1H-inden-1-ones. Four bonds are formed during the tandem process.
Iodine-mediated synthesis of benzo[<i>a</i>]fluorenones from yne-enones
作者:Sikkandarkani Akbar、V. John Tamilarasan、Kannupal Srinivasan
DOI:10.1039/c9ra02376c
日期:——
The chalcones derived from o-alkynylacetophenones and aromatic aldehydes (yne-enones) when heated under reflux with iodine in acetic acid gave a range of benzo[a]fluorenone derivatives in moderate to good yields. The transformation involves the formation of a vinyl indenone intermediate through regioselective alkyne hydration and intramolecular aldol condensation followed by electrocyclic ring closure
衍生自邻炔基苯乙酮和芳族醛(炔-烯酮)的查耳酮在与碘在乙酸中加热回流时,会以中等至良好的产率生成一系列苯并[ a ]芴酮衍生物。该转化涉及通过区域选择性炔烃水合和分子内醛醇缩合形成乙烯基茚酮中间体,然后进行电环闭合和芳构化。
Domino Reaction between Nitrosoarenes and Ynenones for Catalyst-Free Preparation of Indanone-Fused Tetrahydroisoxazoles
A catalyst-free domino reaction to synthesize highly functionalized indanone-fused tetrahydroisoxazole from easily accessed nitrosoarene and 1,6-ynenone with good chemo- and regioselectivity was disclosed. This unprecedented domino reaction represents a new strategy for multifunctionalization of an internal alkyne with nitrosoarene by formation of two rings and four bonds in a single operation.
Oxidative tandem annulation of 1-(2-ethynylaryl)prop-2-en-1-ones catalyzed by cooperative iodine and TBHP
作者:Bang Liu、Jiang Cheng、Yang Li、Jin-Heng Li
DOI:10.1039/c8cc09271k
日期:——
metal-free I2-catalyzed oxidative tandem annulation of 1,6-enynes by employing tert-butyl hydroperoxide (TBHP) as the oxidant and the oxygen atom resource for the synthesis of 1H-cyclopropa-[b]naphthalene-2,7-diones is developed. This reaction allows the formation of three new chemical bonds through selective radicaladdition across the CC bond and tandem cyclization cascades, which features a broad
以叔丁基过氧化氢(TBHP)为氧化剂和氧原子资源,以合成1 H-环丙烷-[ b ]萘-的新型无金属I 2催化1,6-烯炔氧化串联氧化反应开发了2,7-二酮。该反应允许通过跨C C键的选择性自由基加成和串联环化级联反应形成三个新的化学键,其特征在于1,6-烯炔的范围宽广,并且具有出色的化学和非对映选择性。