Efficient Synthesis of Substituted Indene Derivatives
摘要:
An efficient protocol for the synthesis of new functionalized indenes 3 was successfully realized. Thus the coupling reaction of allyl acetate 2 with Grignard reagents in the presence of a catalytic amount of LiCuBr2 at low temperature afforded pure ethyl 1-alkyl-1H-indenes-2-carboxylate 3 in good yields.
开发温和有效的合成策略,从容易获得的起始材料开始生产重要的分子,在有机合成中是必不可少的。在此,我们提出了一种三氟甲磺酸驱动的双环化途径,从简单的2-甲酰基(或2-酰基)肉桂酸酯和酚类生产功能化的茚并[2,1- c ]色烯-6(7 H )-酮。值得注意的是,该方案通过在单锅中激活非反应性酯部分,能够在无金属反应条件下构建两个 C-C 键和一个 C-O 键。中间体茚醇酯的分离可能表明通过烯酸酯的邻近双键与邻羰基部分进行自分子内环加成,随后用苯酚进行亲电攻击以及随后的环缩合途径。此外,还检查了光物理性质。
Intramolecular Tandem Seleno-Michael/Aldol Reaction: A Simple Route to Hydroxy Cyclo-1-ene-1-carboxylate Esters
作者:Piotr Banachowicz、Jacek Mlynarski、Szymon Buda
DOI:10.1021/acs.joc.8b01853
日期:2018.9.21
Intramolecular tandem seleno-Michael/aldol reaction followed by an oxidation–elimination process can be an efficient tool for the construction of hydroxy cyclo-1-ene-1-carboxylate esters from oxo-α,β-unsaturated esters. Generation of lithium selenolate from elemental selenium and n-BuLi provides a simple and efficient one-pot access to cyclic endo-Morita–Baylis–Hillman adducts.
A Single-Flask Synthesis of Morita–Baylis–Hillman Adducts from Ethoxyacetylene and Carbonyl Compounds: Synthesis of Subamolides D and E
作者:Kevin Ng、Thomas G. Minehan
DOI:10.1021/acs.orglett.6b01772
日期:2016.8.19
keto/aldehyde acetals (X = OMe) followed by the addition of a Lewis acid leads to five-, six-, and seven-membered hydroxycycloalkene carboxyates. The utility of this method is demonstrated in the synthesis of the α-alkylidene lactone natural products subamolide D and E.