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2,2-Dimethoxy-N-(thiophen-2-ylmethyl)ethanamine (5 g, 24 mmol) was dissolved in anhydrous dichloromethane and pyridine (5.82 mL, 72 mmol) was added to the reaction. The mixture was cooled down to 0° C. and was treated with para-toluenesulfonyl chloride (5.6 g, 29 mmol) added portionwise. The reaction was allowed to stir at 0° C. for 4 h and was then washed 3 times with 1 N HCl, water and a saturated solution of sodium bicarbonate. The organic layer was dried with sodium sulfate. Purification by flash chromatography using a gradient of 5-30% ethyl acetate in hexanes yielded a white crystalline solid (7.4 g) MS (M+H)+ 356.

1. additionadded portionwise
2. washwas then washed 3 times with 1 N HCl, water
3. dry with materialThe organic layer was dried with sodium sulfate
4. customPurification by flash chromatography