in neat (no solvent) PhB(SEt)2 cooled to -78°C, dry 3-methylpiperidine added slowly with stirring, mixt. set aside attain room temp., gently refluxed for 3 h; removed C2H5SH, residue distd., elem. anal.;

good yields;

byproducts: C6F5CH(SC2H5)2;