A straightforward synthesis of substituted 2-oxindoles, 3-hydroxy-2-oxindoles, and isatins has been developed. Easily accessible furans were transformed into tetrahydropyranopyrrolones by a singlet oxygen initiated cascade reaction sequence. An acid-catalyzedrearrangement, followed by aromatization, gave access to a variety of 2-oxindole motifs, which were oxidized to 3-hydroxy-2-oxindoles or isatins
(DHQ)<sub>2</sub>AQN-Catalyzed Asymmetric Substitution of Isatin-Derived Hydrazones with O-Boc-Protected Morita–Baylis–Hillman Adducts: A Strategy for Synthesizing Enantioenriched Azo Compounds Incorporating an Oxindole Scaffold
作者:Hai-Bin Yang、Yun-Zhou Zhao、Rui Sang、Min Shi
DOI:10.1021/jo5003246
日期:2014.4.18
The first example for the preparation of enantioenriched azo compounds from hydrazones and Morita–Baylis–Hillmanadducts has been developed, affording azo compounds incorporating an oxindole scaffold in up to 91% yield along with a 93% ee value under the catalysis of (DHQ)2AQN.
A Catalytic Asymmetric Isatin-Involved Povarov Reaction: Diastereo- and Enantioselective Construction of Spiro[indolin-3,2′-quinoline] Scaffold
作者:Feng Shi、Gui-Juan Xing、Ren-Yi Zhu、Wei Tan、Shujiang Tu
DOI:10.1021/ol303154k
日期:2013.1.4
The first catalytic asymmetric isatin-involved Povarov reaction has been established. This method provides an unprecedented approach to access the enantioenriched spiro[indolin-3,2′-quinoline] scaffold with concomitant creation of two quaternary stereogenic centers in high yields and excellent stereoselectivities (all >99:1 dr's, up to 97% ee).
已经建立了第一个催化的不对称的由靛红参与的Isova Povarov反应。该方法提供了一种空前的方法来获得对映体富集的螺[吲哚-3,2'-喹啉]支架,并伴随以高收率和出色的立体选择性(全部> 99:1 dr 's,高达97%)创建了两个四级立体生成中心。ee)。
Diastereo- and Enantioselective Construction of Dihydroisocoumarin-Based Spirooxindole Frameworks <i>via</i>
Organocatalytic Tandem Reactions
作者:Jia-Le Wu、Bai-Xiang Du、Yu-Chen Zhang、Ying-Ying He、Jing-Yi Wang、Ping Wu、Feng Shi
DOI:10.1002/adsc.201600271
日期:2016.9.1
An organocatalyticasymmetric approach has been developed for the ennantioselective construction of dihydroisocoumarin‐based spirooxindole frameworks in high yields, excellent diastereo‐ and enantioselectivities (up to 99%, all >95:5 dr, up to 99% ee). This approach takes advantage of chiral thiourea‐tertiaryamine catalyzed tandemreaction of isatins with enolizable homophthalic anhydride, which has
One-Pot Tandem Diastereoselective and Enantioselective Synthesis of Functionalized Oxindole-Fused Spiropyrazolidine Frameworks
作者:Liang-Yong Mei、Xiang-Ying Tang、Min Shi
DOI:10.1002/chem.201403990
日期:2014.10.6
A highly efficient palladium(0)‐catalyzed asymmetric [3+2] cycloaddition using 3‐diazooxindoles serving as dipolarophiles affords functionalized pyrazolidinederivatives in an atom‐economical way. In addition, by trapping the pyrazolidinederivatives with maleimides, the corresponding spiropyrazolidine oxindoles containing multiple stereogenic centers have been obtained in high yields along with moderate