机译:Enantioselective construction of dihydropyranone-fused indoles by 3 + 3 annulation of in situ-derived indolin-3-ones and unsaturated carboxylic esters
机译:Synthesis of 1,4-dithiins and 1,4-diselenins from alkynes and elemental sulfur/selenium under transition metal-free conditions with high regioselectivity