practical 1,3-dipolar [3 + 2] cycloaddition of N-2,2,2-trifluoroethylisatin ketimines and (Z)-4-((chromone-3-yl)methylene)oxazolones under phase-transfer catalysis is described. Using tetrabutylammonium bromide as a catalyst, the cycloaddition allows rapid assembly of a series of bispiro heterocycles merging five pharmacophores, the trifluoromethyl group, oxazolone, pyrrolidine, oxindole, and chromone
描述了N -2,2,2-三氟乙基靛红酮亚胺和 ( Z )-4-((色酮-3-基)亚甲基)恶唑酮在相转移催化下的实际 1,3-偶极 [3 + 2] 环加成反应。使用四丁基溴化铵作为催化剂,环加成可以快速组装一系列双螺杂环,这些双螺杂环融合了五个药效团,三氟甲基、恶唑酮、吡咯烷、羟吲哚和色酮基序,具有中等至优异的产率和优异的非对映选择性。对反应动力学的研究表明相转移催化策略的效率很高。
Ghosh, Chandra Kanta; Bhattacharyya, Atanu; Ghosh-Dastidar, Partha Pratim, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1987, vol. 26, # 1-12, p. 423 - 426