Tandem Synthesis of α-Diazoketones from 1,3-Diketones
作者:Jianlan Zhang、Wenwen Chen、Dayun Huang、Xiaobao Zeng、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.joc.7b01187
日期:2017.9.1
A highly efficient synthesis of α-diazoketone was achieved by simply stirring the mixture of 1,3-diketone, TsN3, and MeNH2 in EtOH. It was a tandem reaction including a novel primary amine-catalyzed Regitz diazo transfer of 1,3-diketone and a novel primary amine-mediated C–C bond cleavage of 2-diazo-1,3-diketone.
Substituents at the boron unit of dipyrrolyldiketone boron complexes as π-conjugated acyclic anion receptors play crucial roles for the tuning of solid-statemolecularassemblies, anion-binding behaviour and electronic and opticalproperties. In particular, emission quantum yields can be significantly tunable by boron substituents and pyrrole α-aryl moieties.
Introduction of a BINOL-boron moiety to dipyrrolyldiketones as precursors of anion-responsiveπ-conjugatedmolecules results in the formation of a chiral environment in the form of anion-free receptors and anion-binding complexes. Conformation changes by inversion (flipping) of two pyrrole rings as a result of anion binding can control the chiroptical properties of the anion receptors. In particular