Base-Catalyzed Diastereoselective [3 + 3] Annulation of 3-Isothiocyanatooxindoles and Azomethine Imines
摘要:
An unprecedented diastereoselective [3 + 3] annulation of 3-isothiocyanatooxindoles and azomethine imines was catalyzed by Et3N, affording 3,3'-triazinyl spirooxindoles in excellent yields and diastereoselectivities under mild conditions.
Facile construction of novel imidazolidine-spirooxindoles via diastereoselective cycloaddition of N-acylhydrazine-derived imines with 3-isothiocyanato oxindoles
presence of 10 mol% of Na2CO3, the desired imidazolidine-spirooxindoles were obtained in 81–99% yield with up to 99 : 1 dr by means of the diastereoselective [3 + 2] cycloaddition of N-acylhydrazine-derived imines with 3-isothiocyanatooxindoles. Single-crystal X-ray structure analysis was conducted to determine the relative stereochemistry of the imidazolidine-spirooxindoles. Diastereoselective access
在存在10 mol%的Na 2 CO 3时,通过衍生自N-酰基肼的非对映选择性[3 + 2]环加成反应,可以81-99%的收率获得所需的咪唑烷-螺氧并吲哚,最高可达99:1 dr。亚胺与3-异硫氰酸根合吲哚。进行了单晶X射线结构分析,以确定咪唑烷-螺氧还吲哚的相对立体化学。拟议的机制假设非对映选择性进入咪唑烷-spirooxindoles。
Construction of spirothioureas having an amino quaternary stereogenic center <i>via</i> a [3 + 2] annulation of 3-isothiocyanato oxindoles with 2-aminoacrylates
作者:Hou-Ze Gui、Yin Wei、Min Shi
DOI:10.1039/c8ob02748j
日期:——
useful and convenient strategy for the diastereoselective synthesis of spirothioureas having an amino quaternary stereogenic center via a [3 + 2] annulation of 3-isothiocyanato oxindoles with 2-aminoacrylates was established. A diverse set of spirooxindole derivatives were synthesized in good to excellent yields and diastereoselectivities. Good enantioselectivities (up to 96 : 4 er) were obtained in
Squaramide-Catalyzed Asymmetric Michael/Cyclization Cascade Reaction of Unsaturated Thiazolidinones and 3-Isothiocyanato Oxindoles: Synthesis of New Bispirocyclic Heterocycles
作者:Da-Ming Du、Yong-Xing Song
DOI:10.1055/s-0036-1591527
日期:2018.4
heterocycles bearing three contiguous chiral centers including two quaternary one via a Michael/cyclization cascadereaction has been developed. Using bifunctional cinchona-derived squaramide as catalyst, the reactions of 3-isothiocyanato oxindoles with unsaturated thiazolidinone derivatives proceeded smoothly under mild reaction conditions to afford a series of complex chiral oxindole-pyrrolidone-thiazolidinone
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
Construction of Novel Tetrahydro-<i>β</i>-carboline-1-thione Spirooxindoles by Brønsted Acid Mediated Formal [3+3] Cyclization of 3-Indolylmethanols with 3-Isothiocyanato Oxindoles
p‐Toluenesulfonic acid mediated formal [3+3] cyclization of 3‐indolylmethanols with 3‐isothiocyanato oxindoles was realized. This transformation allowed for the synthesis of a series of novel tetrahydro‐β‐carboline‐1‐thione spirooxindoles in moderate to excellent yields (up to 99%) with generally good diastereoselectivities (up to >20:1). The structure of one product was determined by an X‐ray crystal