common in molecular structures with significant biological and pharmaceutical activities. Herein, the organocatalytic asymmetriccascade Michael cyclization reaction of 2-hydroxynaphthalene-1,4-diones to isatylidenemalononitriles has been developed, which provided the desired spiro[4H-benzo[g]chromene-indoline] derivatives in up to 99% yield with up to 99% ee. To illustrate the potential utility of
摘要 吡喃并萘醌单元常见于具有显着生物学和药学活性的分子结构。在此,已开发了2-羟基萘-1,4-二酮与异亚丙基丙二腈的有机催化不对称级联迈克尔环化反应,该反应以高达99%的收率提供了所需的螺[4 H-苯并[ g ]亚甲基二氢吲哚]衍生物具有高达99%的ee。为了说明这些产品的潜在用途,进行了进一步的转化,以中等收率得到了螺多杂环化合物,而不会损失对映选择性(> 99%ee)。这些螺[苯并[ g]的生物学评估[1,5-二甲基二氢吲哚]衍生物对多种癌细胞具有优异的抗增殖活性,在浓度为50μM时具有93%至99%的高抑制率。 吡喃并萘醌单元常见于具有显着生物学和药学活性的分子结构。在此,已开发了2-羟基萘-1,4-二酮与异亚丙基丙二腈的有机催化不对称级联迈克尔环化反应,该反应以高达99%的收率提供了所需的螺[4 H-苯并[ g ]亚甲基二氢吲哚]衍生物具有高达99%的ee。为了说明这些产品的潜在
Synthesis of spiro[2,3-dihydrofuran-3,3′-oxindole] derivatives <i>via</i> a multi-component cascade reaction of α-diazo esters, water, isatins and malononitrile/ethyl cyanoacetate
作者:Taoda Shi、Shenghan Teng、Yajie Wei、Xin Guo、Wenhao Hu
DOI:10.1039/c9gc01751h
日期:——
We report a green synthesis of spiro[2,3-dihydrofuran-3,3′-oxindole] derivatives which are of potential value in medicinal chemistry. We are able to access spiro[2,3-dihydrofuran-3,3′-oxindole] derivatives via a Cu(OTf)2-catalyzed or Cu(OTf)2/Rh2(OAc)4-cocatalyzed multi-component cascade reaction of α-diazo esters, water, isatins and malononitrile/ethyl cyanoacetate. The reaction can be accomplished
Organocatalytic Enantioselective 1,3-Dipolar Cycloadditions between Seyferth–Gilbert Reagent and Isatylidene Malononitriles: Synthesis of Chiral Spiro-phosphonylpyrazoline-oxindoles
作者:Taiping Du、Fei Du、Yanqiang Ning、Yungui Peng
DOI:10.1021/acs.orglett.5b00311
日期:2015.3.6
A new method has been developed for the catalytic enantioselective 1,3-dipolar cycloaddition of the Seyferth–Gilbert reagent (SGR) to isatylidene malononitriles using a cinchonaalkaloidderivative as a catalyst. This method allowed for the synthesis of a series of chiral spiro-phosphonylpyrazoline-oxindoles in good yields with excellent enantioselectivities. The synthetic utility of this method was
Organocatalytic enantioselective conjugate addition of ketones to isatylidine malononitriles
作者:Lu Liu、Deyan Wu、Xiangmin Li、Sinan Wang、Hao Li、Jian Li、Wei Wang
DOI:10.1039/c2cc17067a
日期:——
An enantioselective Michael addition of ketones to alkylidenemalononitriles catalyzed by chiral primary amine I with (R)-5c as a co-catalyst in good yields (>90%) and with good enantioselectivities (85–96% ee) has been developed. The strategy has also been extended to a three-component version through a domino Knoevenagel/Michael sequence with similar or better outcomes.
Molecular sieve mediated sequential Knoevenagel condensation/decarboxylative Michael addition reaction: efficient and mild conditions for the synthesis of 3,3-disubstituted oxindoles with an all carbon quaternary center
作者:Yi-Lin Guo、Yu-Hsun Li、Hsuan-Hao Chang、Ting-Shen Kuo、Jeng-Liang Han
DOI:10.1039/c6ra16975a
日期:——
one-pot, molecularsieve mediated sequential Knoevenagel condensation/decarboxylative Michael addition reaction has been developed. We discovered that the molecularsieves not only promoted the Knoevenagel condensation of isatins and malononitrile to generate isatylidene malononitriles, but also promoted the later decarboxylative Michael addition reactions of β-ketoacids and malonic acid half thioesters