The ringexpansion of small-ring compounds provides a powerful method for the construction of various cyclic compounds. Herein, nitrene equivalent mediated metal-free ringexpansions of alkylidenecyclopropanes (ACPs) and an alkylidenecyclobutane (ACB) were described. In this synthesis, a series of aryl-substituted cyclobutylidene and cyclopentylidene hydrazine derivatives were obtained under mild conditions
Palladium-catalyzed oxidative cyclization of aniline-tethered alkylidenecyclopropanes with O<sub>2</sub>: a facile protocol to selectively synthesize 2- and 3-vinylindoles
作者:Bo Cao、Marwan Simaan、Ilan Marek、Yin Wei、Min Shi
DOI:10.1039/c6cc08731k
日期:——
A novel palladium-catalyzedoxidative cyclization of aniline-tethered alkylidenecyclopropanes using molecularoxygen as terminal oxidant through [small beta]-carbon elimination of aminopalladation intermediates is disclosed. The reaction opens up an effective way to...
Thermal induced intramolecular [2 + 2] cycloaddition of allene-ACPs
作者:Kai Chen、Run Sun、Qin Xu、Yin Wei、Min Shi
DOI:10.1039/c3ob40911b
日期:——
A facile synthetic method for preparation of bicyclo[4.2.0] nitrogen heterocycles has been developed via a thermal induced intramolecular [2 + 2] cycloaddition reaction of allene-ACPs. The DFT calculations indicate that this intramolecular cycloaddition proceeds in a concerted manner and a strained small ring is essential.