我们报告了一种高效和高度非对映选择性的协议,可通过不饱和酯单元的α-硝基芳基酮的分子内迈克尔型环化来快速构建3-硝基取代的4-苯并二氢吡喃酮。发现催化量的KO t Bu对于该转化的高非对映选择性控制至关重要。通过该方案,可以高收率和优异的合成率合成具有高非对映选择性的一系列3,3-二取代的3-硝基-4-苯并二氢呋喃酮,并显示出中等至良好的体外抗肿瘤活性,代表了有望用于进一步药物开发的抗肿瘤药物。
Esters of 2,3-Dihydro-3-oxobenzofuran-2-acetic Acid and 3,4-Dihydro-4-oxo-2H-1-benzopyran-3-acetic Acid by Intramolecular Stetter Reactions
作者:Engelbert Ciganek
DOI:10.1055/s-1995-4100
日期:1995.10
Intramolecular Stetter reaction of methyl 3-(2-formylphenoxy)-prop-2-enoate catalyzed by 3-benzyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium chloride in refluxing dimethylformamide gave methyl 2,3-dihydro-3-oxobenzofuran-2-acetate in 39% yield. The presence of a tertiary amine, which in this case caused destruction of the product, is thus not necessary for the success of the Stetter reaction. When sodium cyanide was used as the catalyst, methyl 2-cyano-2,3-dihydro-4-hydroxy-2H-1-benzopyran-3-carboxylate was formed in 58% yield. Methyl 4-(2-formylphenoxy)but-2-enoate underwent intramolecular Stetter reaction to give methyl 3,4-dihydro-4-oxo-2H-1-benzopyran-3-acetate in 86% yield. Base-catalyzed cyclization of methyl 4-(2-formylphenoxy)but-2-enoate gave methyl-1-benzoxepin-4-carboxylate in 52% yield.
Diastereoselective synthesis of 3,3-disubstituted 3-nitro-4-chromanone derivatives as potential antitumor agents
作者:Huiqing Chen、Jia Xie、Dong Xing、Jinping Wang、Jie Tang、Zhengfang Yi、Fei Xia、Wen-Wei Qiu、Fan Yang
DOI:10.1039/c8ob02761g
日期:——
protocol, a series of 3,3-disubstituted 3-nitro-4-chromanones were synthesized in good to excellent yields with high diastereoselectivities and showed moderate to good in vitro antitumor activities, representing promising antitumor hits for further drug discovery.
我们报告了一种高效和高度非对映选择性的协议,可通过不饱和酯单元的α-硝基芳基酮的分子内迈克尔型环化来快速构建3-硝基取代的4-苯并二氢吡喃酮。发现催化量的KO t Bu对于该转化的高非对映选择性控制至关重要。通过该方案,可以高收率和优异的合成率合成具有高非对映选择性的一系列3,3-二取代的3-硝基-4-苯并二氢呋喃酮,并显示出中等至良好的体外抗肿瘤活性,代表了有望用于进一步药物开发的抗肿瘤药物。
Synthesis of 2,3-Disubstituted Benzofurans from<i>ortho</i>-Acylphenols
作者:Jinsung Tae、Kwang-Ok Kim
DOI:10.1055/s-2004-834951
日期:——
2,3-Disubstituted benzofuran derivatives were synthesized from ortho-acylphenols in two steps. The β-aryloxyacrylates prepared from the ortho-acylphenols were treated with n-Bu3SnH/AIBN and then with 5% HCl-EtOH to afford 2,3-disubstituted benzofurans.