1: 1.) BF3*OEt2 / 1.) THF, 0 deg C, 5 min, 2.) THF, 0 deg C, 1 h 2: Ph3P, NaH / tetrahydrofuran / 0.5 h / Ambient temperature View Scheme

boron trifluoride diethyl etherate; sodium methylate; magnesium; triphenylphosphine 1) THF, 2) CH2Cl2, 0 deg C, 1h, 3) methanol, 4h, room temperature (one pot reaction); other 2-(acylmethylseleno)benzothiazoles; Product distribution;

1: 1.) BF3*OEt2 / 1.) THF, 0 deg C, 5 min, 2.) THF, 0 deg C, 1 h 2: Ph3P, NaH / tetrahydrofuran / 0.5 h / Ambient temperature View Scheme

boron trifluoride diethyl etherate; sodium methylate; magnesium; triphenylphosphine 1) THF, 2) CH2Cl2, 0 deg C, 1h, 3) methanol, 4h, room temperature (one pot reaction); other 2-(acylmethylseleno)benzothiazoles; Product distribution;