SCHEDULED MAINTENANCE
PIII-Mediated intramolecular cyclopropanation and metal-free synthesis of cyclopropane-fused heterocycles†
Jie
Han 
*a
and
Zhengjie
He
*ab
*a
and
Zhengjie
He
*ab
Abstract
A P(NMe2)3-mediated reductive intramolecular cyclopropanation is developed for the first time, which provides facile access to a wide variety of cyclopropane-fused heterocycles including chromanes, tetrahydroquinolines, lactones, and lactams. Catalytic hydrogenative ring-expansion of the cyclopropane-fused heterocycles is also elaborated, leading to various structurally important medium-sized heterocycles.
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