62942-43-2Relevant articles and documents
Method for preparing formyl methylene triphenylphosphine
-
, (2020/12/14)
The invention discloses a method for preparing formyl methylene triphenylphosphine. The method comprises the following steps: reacting triphenylphosphine with excessive chloroacetaldehyde dimethyl acetal under the catalysis of a proper catalyst to obtain corresponding quaternary phosphonium salt; dissolving quaternary phosphonium salt in water, adding a trace amount of inorganic acid to hydrolyzethe quaternary phosphonium salt, dropwise adding the hydrolyzed quaternary phosphonium salt into an aqueous solution of alkali according to a conventional method, and filtering and washing precipitates to directly obtain formyl methylene triphenylphosphine. The method has the advantages of no use of expensive reagents, simple operation, high yield, less three wastes, and easy realization of industrialization.
Synthesis of Polysubstituted Pyridines via a One-Pot Metal-Free Strategy
Wei, Hongbo,Li, Yun,Xiao, Ke,Cheng, Bin,Wang, Huifei,Hu, Lin,Zhai, Hongbin
supporting information, p. 5974 - 5977 (2016/01/09)
An efficient strategy for the one-pot synthesis of polysubstituted pyridines via a cascade reaction from aldehydes, phosphorus ylides, and propargyl azide is reported. The reaction sequence involves a Wittig reaction, a Staudinger reaction, an aza-Wittig reaction, a 6π-3-azatriene electrocyclization, and a 1,3-H shift. This protocol provides quick access to the polysubstituted pyridines from readily available substrates in good to excellent yields.
