Wang的对映选择性硫脲催化的螺旋环化为放线菌Actinoalloteichus cyanogriseus的海洋天然产物氰化物的第一个四环类似物铺平了道路。所述合成包括从亚烷基吲哚酮开始的七个步骤。(E)-苯乙烯基侧链的安装面临区域化学问题,这是通过事先转化为乙内酰脲并采用巴蒂条件来避免的。螺二氢吲哚吡咯并[1,2- c ]咪唑和氰化物的ECD光谱比较证实了天然产物的绝对构型。
设计并合成了一类新型的(2E)-(2-氧代-1,2-二氢-3 H-吲哚-3-亚烷基)乙酸酯衍生物,作为有效的抗增殖剂。这些化合物大多数对某些肿瘤细胞系(包括SK-BR-3,MDA-MB-231,HCT-116,SW480,Ovcar-3,HL-60,Saos-2和HepG2)显示出有效的抗增殖活性。化合物8c和11h被认为是最有效的化合物,而HL-60,HCT116和MDA-MB-231是最敏感的细胞系。机理研究表明,化合物8c通过抑制TrxR增强活性氧的水平,然后通过激活HCT116细胞中的凋亡蛋白,bax和Caspase 3来诱导凋亡。SAR的初步分析表明,双键和酯基的修饰对抗增殖活性有很大影响。我们的发现表明,值得进一步研究(2E)-(2-oxo-1,2-dihydro-3 H -indol-3-ylidene)acetate的抗肿瘤效力。
Asymmetric Cross [10+2] Cycloadditions of 2‐Alkylidene‐1‐indanones and Activated Alkenes under Phase‐Transfer Catalysis
作者:Yang Yang、Ying Jiang、Wei Du、Ying‐Chun Chen
DOI:10.1002/chem.201904930
日期:2020.2.6
have been employed in diverse challenging higher-order cycloaddition reactions. Here, the first chemoselective and asymmetric cross [10+2] cycloaddition reaction between activated 2-alkylidene-1-indanones and a variety of electron-deficient alkenes has been developed, relying on the in situ generation of dearomative 1-hydroxyl isobenzofulvene anion intermediates under the catalysis of a newly designed
Synthesis of Spiro[pyrazolin-3,3′-oxindoles] and 3-Arylcarbonylmethyl Substituted Ylideneoxindoles by 1,3-Dipolar Cycloadditions of 3-Ylideneoxindoles and In-Situ-Generated α-Diazoketones
An efficient 1,3-dipolarcycloaddition of 3-ylideneoxindoles with in-situ-generated α-diazoketones to potentially biological active spiro[pyrazolin-3,3′-oxindoles] 4 with excellent regioselectivity and diastereoselectivity and synthetically useful building block 3-arylcarbonylmethyl substituted ylideneoxindoles 5 in different conditions has been developed. This method has advantages of mild conditions
A highlydiastereoselective and regioselective [2+2]-cycloaddition reaction of 3-ylideneoxindoles has been accomplished using visible light photocatalysis. This visible light photocatalytic protocol allows an expedient access to diversely functionalized and structurally constrained oxindolederivatives containing two spirocycles and four stereogenic centers, including two all-carbon quaternary centers
Catalytic Asymmetric Michael Addition/Cyclization of Isothiocyanato Oxindoles: Highly Efficient and Versatile Approach for the Synthesis of 3,2′-Pyrrolidinyl Mono- and Bi-spirooxindole Frameworks
作者:Yi-Ming Cao、Fang-Fang Shen、Fu-Ting Zhang、Rui Wang
DOI:10.1002/chem.201204114
日期:2013.1.21
A‐spiro‐ing to greatness: The catalytic asymmetric Michael addition/cyclization of isothiocyanato oxindoles has been realized. This versatile approach provides an easy and highly efficient way to access not only the enantioselective synthesis of 3,2′‐pyrrolidinyl spirooxindole frameworks, but also the construction of enatiomerically enriched bi‐spirooxindoles containingthreecontiguous stereocenters
作者:Madavi S. Prasad、Murugesan Sivaprakash、Sankar Bharani、L. Raju Chowhan
DOI:10.1039/d2ob02228a
日期:——
Herein, for the first time, we report the asymmetric synthesis of an unexpected stereoisomer of spirohexahydroindole via a trienamine-catalysed remote olefin E/Z isomerisation/[4 + 2]-cycloaddition reaction. The reaction afforded a vast library of aesthetically pleasing spirooxindole hexahydroindole scaffolds with exceptional enantio- and diastereo-selectivities (up to 95% yield, 99% ee and >99 : 1