Cu-Catalyzed Cascade Annulation of Alkynols with 2-Azidobenzaldehydes: Access to 6<i>H</i>-Isochromeno[4,3-<i>c</i>]quinoline
作者:Xiao-Feng Mao、Xiao-Ping Zhu、Deng-Yuan Li、Pei-Nian Liu
DOI:10.1021/acs.joc.7b00937
日期:2017.7.7
A copper-catalyzedcascade reaction of alkynols and 2-azidobenzaldehydes has been achieved, giving 6H-isochromeno[4,3-c]quinoline in yields of 40–81%. This reaction provides a novel, concise strategy for rapidly constructing compounds with fused N- and O-containing heterocycles. In contrast to previously reported reactions of alkynols in which the first step is intramolecular cycloisomerization, the
铜催化的炔醇和2-叠氮基苯甲醛的级联反应已经实现,得到6 H-异色酚[4,3- c ]喹啉,产率为40-81%。该反应提供了一种用于快速构建化合物与稠合的N A新颖,简洁策略-和O -含有杂环。与先前报道的炔醇的反应第一步是分子内环异构化相反,炔醇的这种新反应的第一步是熵不利的分子间加成。然后将所得的半缩醛中间体进行分子内环化和芳构化以提供产物。
Inhibitors of Acyl CoA:Cholesterol Acyltransferase
Conformational restriction of previously disclosed acyclic diphenylethyl)diphenylacetamides led to the discovery of several potent inhibitors of acyl CoA:cholesterol acyltransferase (ACAT). cis-[2-(4-Hydroxyphenyl)-1-indanyl]diphenylacetamide (4a) was the mo st potent ACAT inhibitor identified (IC50 = 0.04 mu M in an in vitro rat hepatic microsomal ACAT assay, ED(50) = 0.72 mg/kg/day in cholesterol-fed hamsters).
A new route to 3,4-dihydro-2H-1-benzopyrans substituted at 3-position via palladium-catalysed reactions
3,4-Dihydro-2H-1-benzopyrans substituted at 3-position were prepared via palladium-catalysed reactions between a triflate and several coupling reagents (alkyl or aryl tin reagents and borane derivatives) according to Stille or Suzuki methodologies. (C) 1997 Published by Elsevier Science Ltd.
Ring-closing metathesis in flavonoid synthesis, part 3: isoflavenes
作者:Tanya Pieterse、Charlene Marais、Barend C. B. Bezuidenhoudt