No abstract

In the synthesis of five-membered heterocycles by the annulation of epoxides with heterocumulenes such as carbon dioxide and isocyanates, we developed the indium-tin catalytic system and synthesized various cyclic adducts including novel types products under mild reaction conditions.

The reaction of substituted epoxides with CO2 under mild conditions allows the preparation of title compounds with tolerance of a variety of functional groups. -(SHIBATA*, I.; MITANI, I.; IMAKUNI, A.; BABA, A.; Tetrahedron Lett. 52 (2011) 6, 721-723, http://dx.