期刊
ORGANIC LETTERS
卷 20, 期 22, 页码 7192-7196出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.8b03118
关键词
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资金
- Chung-Ang University Research Scholarship
- National Research Foundation of Korea (NRF) grant - Korean government (MSIP) [NRF-2015R1ASA1008958]
A facile approach to spirocyclic pyrrolidinonylformimidamides has been developed via three-component reactions of isocyanides, alkenes, and amines. The reaction proceeds through a sequence of two distinct reaction pathways; the base-catalyzed conjugate addition of alpha-isocyano lactams to electron-deficient alkenes and the Ag(I)-catalyzed amine insertion to the isocyanide moiety. Both reactions display markedly different reaction kinetics, allowing the one-pot three-component reactions to be performed in the presence of respective catalysts, a Bronsted base and a silver salt. The formation of spirocyclic pyrrolidin-2-ones represents an unusual use of alpha-isocyano lactam as a two-atom unit in a formal [3 + 2] cycloaddition reaction. The successful identification of ways to defy the typical three-atom unit role of alpha-isocyano carbonyl compounds in the [3 + 2] cycloaddition pathways manifests a rapid assembly of medicinally important spirocyclic scaffolds from readily available starting materials.
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