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
Michael Addition Catalyzed by Chiral Secondary Amine Phosphoramide Using Fluorinated Silyl Enol Ethers: Formation of Quaternary Carbon Stereocenters
A chiralsecondaryaminephosphoramide was developed and identified as a powerful catalyst for the Mukaiyama–Michael addition of fluorinatedenolsilylethers to tetrasubstituted olefins. The resulting products are obtained with high enantioselectivities and contain a quaternarycarbonstereocenter bearing either a difluoroalkyl or monofluoroalkyl group.
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.