5,5-dimethyl-1,2-thiazolidine 1,1-dioxide

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 0° C. solution of 2-(2,4-dimethoxybenzyl)-5,5-dimethylisothiazolidine-1,1-dioxide (0.220 g, 0.7 mmol) in methylene chloride (10 mL) was added trifluoroacetic acid (3.591 mL, 48.3 mmol) and the resulting red solution was stirred at 0° C. for 3 hrs and concentrated under reduced pressure. The crude product was purified by silica gel chromatography (20-80% ethyl acetate/hexanes) to give a clear oil (0.087 g, 86%). 1HNMR (300 MHz, CDCl3) δ 4.61 (br s, 1H), 3.32-3.26 (td, 2H, J=5.1, 7.1 Hz), 2.25-2.20 (t, 2H, J=7.2 Hz), 1.43 (s, 6H). concentrated under reduced pressure The crude product was purified by silica gel chromatography (20-80% ethyl acetate/hexanes)