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
Asymmetric Synthesis of Spirooxindoles with Seven Stereocenters via Organocatalyzed One‐pot Three‐component Sequential Cascade Reactions
作者:Bo‐Liang Zhao、Da‐Ming Du
DOI:10.1002/adsc.201900218
日期:2019.7.11
three‐component Michael/Mannich‐Michael/cyclization sequential cascade reaction for the construction of bispirooxindole‐spirooxindoles was developed in good yields with excellent stereoselectivities (up to >20:1 dr, 99% ee). A series of original cinnamoyl‐3‐ylideneoxindoles have been applied to this sequential cascade strategy for the first time. This new strategy provides a process for the enantioselective construction
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
Easy access: A strontium/Schiff base complex as catalyst for the title reaction provided straightforward access to enantiomerically enriched spiro[imidazolidine‐4,3′‐oxindole] compounds, as well as a spiro[imidazoline‐4,3′‐oxindole] through a two‐step conversion from the Mannich adduct.
Stereo‐ and Regioselective Construction of Spirooxindoles Having Continuous Spiral Rings via Asymmetric [3+2] Cyclization of 3‐Isothiocyanato Oxindoles with Thioaurone Derivatives
作者:Hou‐Ze Gui、Zhe Meng、Zhan‐Shuai Xiao、Ze‐Ren Yang、Yin Wei、Min Shi
DOI:10.1002/ejoc.202001146
日期:2020.11.15
A highly efficient enantioselective [3+2] cyclization of 3‐isothiocyanato oxindoles with thioaurone derivatives was developed for the synthesis of spirooxindoles containing continuous spiral ring structures.