Facile Syntheses of 2H-1,2,4-Benzothiadiazine 1,1-Dioxides and 4-Oxo-3,4-dihydroquinazolines from 2-Aminobenzenesulfonamide or 2-Aminobenzamide and Aldehydes in the Presence of Sodium Hydrogen Sulfite
The Facile and Direct Formylation of Organoboron Aromatic Compounds with Benzodithiolylium Tetrafluoroborate
作者:Diego Petruzziello、Andrea Gualandi、Hamza Giaffar、Veronica Lopez-Carrillo、Pier Giorgio Cozzi
DOI:10.1002/ejoc.201300529
日期:2013.8
Organoboron compounds can be used to effect a direct formylation in the absence of transition metals. We report that the direct reaction between boronic derivatives and benzodithiolylium tetrafluoroborate, a commercially available carbenium ionic compound, is possible and provides access to many interesting compounds without the use of transition metals. The direct reaction of the carbenium ion with
Thermal decomposition of a variety of 1,3-benzodithiol-2-ylazides (2), easily obtainable from 1,3-benzodithiolylium salts and sodium azide, gives 1,4,2-benzodithiazines (3) in good yields, thus providing a general synthetic route to these compounds.