In the reaction of monosubstituted oxiranes and heterocumulenes, trialkyltin iodides coordinated by phosphine oxides effectively catalyzed the formation of heterocycles via cleavage at the substituted site in the oxirane ring, while other types of organotincomplexes or noncomplexed organotin iodides promoted selective cleavage at the opposite site. A mechanistic investigation demonstrated that the
Mechanistic Studies of Tetraphenylstibonium Iodide-Catalyzed Cycloaddition of Oxiranes with Heterocumulenes
作者:Masahiro Fujiwara、Akio Baba、Haruo Matsuda
DOI:10.1246/bcsj.63.1069
日期:1990.4
In the selective α-cleavage cycloaddition of oxiranes with heterocumulenescatalyzed by tetraphenylstibonium iodide, the direction of oxirane fission at first stage is not significant, while the difference of reaction behaviors of two antimony alkoxide intermediates (Ph4SbOCH2CH(R1)I and Ph4SbOCH(R1)CH2I), insertion of heterocumulenes and cyclization to original oxiranes, is responsible for the unusual
Various types of five-membered heterocyclic compounds such as 2-iminodioxolanes, 2-oxazolidinones, and 2-iminooxazolidines, can be obtained from the cycloaddition of oxiranes with isocyanates or carbodiimides catalyzed by organotin iodide-Lewis base complexes under very mild conditions (40°C, 2h).