Solvent-free mechanochemical route to naphtho[2,3-b]thiophenes via [3 + 2] oxidative heteroannulation of α-enolicdithioesters and β-oxothioamides with 1,4-naphthoquinone has been achieved at room temperature.
![Graphical abstract: DMAP mediated one-pot domino thienannulation: a versatile, regioselective and green mechanochemical route to naphtho[2,3-b]thiophenes](http://hg.y866.cn/compound/lib/scimg/usr/1/C3RA41100A.jpg)
