Hydroamination Reactions of Alkynes with<i>ortho</i>-Substituted Anilines in Ball Mills: Synthesis of Benzannulated N-Heterocycles by a Cascade Reaction
electrophilic alkynes and anilines with OH, NH, or SH groups in the ortho position. For the heterocycle formation, it was shown that several stress conditions were able to initiate the reaction in the solid state. Processing in a ball mill seemed to be advantageous over comminution with mortar and pestle with respect to process control. In the latter case, significant postreaction modification occurred during
Heating of stablephosphorusylides in boiling dioxane as a solvent results in ring closure with extrusion alcohol and triphenyphosphine and to give alkyl-2-(3-oxo-3,4-dihydro-2H-1,4-benzothiazin-2-yliden)acetates in good to excellent yields.