title: Scaffold-inspired enantioselective synthesis of biologically important spiro[pyrrolidin-3,2'-oxindoles] with structural diversity through catalytic isatin-derived 1,3-dipolar cycloadditions.
abstract: Catalytic asymmetric construction of the biologically important spiro[pyrrolidin-3,2'-oxindole] scaffold with contiguous quaternary stereogenic centers in excellent stereoselectivities (up to >99:1 d.r., 98% ee) has been established by using an organocatalytic 1,3-dipolar cycloaddition of isatin-based azomethine ylides. This protocol represents the first example of catalytic asymmetric 1,3-dipolar cycloadditions involving azomethine ylides generated in situ from unsymmetrical cyclic ketones. In addition, theoretical calculations were performed on the transition state of the reaction to understand the stereochemistry. Preliminary bioassays with these spiro[pyrrolidin-3,2'-oxindole] revealed that several compounds showed moderate cytotoxicity to SW116 cells.
authors.affiliation: School of Chemistry and Chemical Engineering, Xuzhou Normal University, Xuzhou, 221116 P.R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Shi
authors.forename: Zhong-Lin
authors.initials: ZL
authors.lastname: Tao
authors.forename: Shi-Wei
authors.initials: SW
authors.lastname: Luo
authors.forename: Shu-Jiang
authors.initials: SJ
authors.lastname: Tu
authors.forename: Liu-Zhu
authors.initials: LZ
authors.lastname: Gong
mesh_terms: D002384:Catalysis; D018360:Crystallography, X-Ray; D003500:Cyclization; D007211:Indoles / Q000138:chemical synthesis* / Q000737:chemistry; D007510:Isatin / Q000737:chemistry*; D015394:Molecular Structure; D000078183:Oxindoles; D013141:Spiro Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D007211:Indoles; D000078183:Oxindoles; D013141:Spiro Compounds; C575768:spiro(pyrrolidin-3,2'-oxindole); D007510:Isatin