Regioselective Opening of Chalcone Epoxides with Nitrogen Heterocycles Using Indium(III) Chloride as an Efficient Catalyst
摘要:
Indium(III) chloride catalyzes regioselective ring opening of chalcone epoxides with nitrogen heterocycles such as indole, 2-methyl indole, and pyrrole under mild conditions at room temperature to afford 1,3-diaryl-2-hydroxy-3-(1H-3-indolyl/2-pyrrolyl)propan-1-ones in good yields (6088%) within 2050min. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.
<font>β</font>-Cyclodextrin in Water: Highly Versatile and Green Approach for Biomimetic Regioselective Ring Opening of Chalcone Epoxides with Nitrogen Heterocycles
作者:Sumit Kumar、Naveen Kumar Konduru、Nishant Verma、Naseem Ahmed
DOI:10.1080/00397911.2015.1093142
日期:2015.11.17
The formation of new C-C bond through highly regioselectiveringopening of chalcone epoxides to nitrogen-containing heterocycles has been effectively worked out in impressive yields with heterocyclic nucleophiles such as pyrrole, indole, and 2-methyl indole in the presence of β-cyclodextrin using water as solvent at room temperature within 25–50 min. Water, an environmentally friendly reaction medium
摘要 使用杂环亲核试剂如吡咯、吲哚和 2-甲基吲哚,在 β-环糊精存在下,通过查耳酮环氧化物高度区域选择性开环形成含氮杂环,形成新的 CC 键已得到有效解决,产率令人印象深刻。水作为溶剂在室温下在 25-50 分钟内。水是一种环境友好的反应介质,首次用于这些杂环亲核试剂与查耳酮环氧化物作为其 β-环糊精配合物的反应,得到 1,3-二芳基-2-羟基-3-(1H-3-吲哚基/2-吡咯基)丙-1-酮(3a-u)。催化剂可以很容易地回收和循环使用多次而不会损失活性。图形概要
An approach to synthesis of (Z)-2-chloro-1,3-diarylpropen-1-ones by Vilsmeier reagent (bis-(trichloromethyl) carbonate/DMF)
作者:Yi Yi Weng、Jian Jun Li、Wei Ke Su
DOI:10.1016/j.cclet.2011.07.006
日期:2011.12
A series of (Z)-2-chloro-1,3-diarylpropen-1-ones were unexpectedly synthesized in moderate yields by treatment of easily available 2,3-epoxy-1, 3-diarylpropan-1-ones with Vilsmeier reagent, which was derived from bis(trichloromethyl) carbonate (BTC, triphosgene) and DMF. A possible mechanism was also proposed, where sequential ring-opening, halogenation and elimination reactions were involved. (C) 2011 Wei Ke Su. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.