A slurry of AlCl3 (571 mg, 4.29 mmol) in CH2Cl2 (4 ml) was treated with tert-butylaminoborane (746 mg, 8.58 mmol) at 0° C. and stirred for 30 minutes. Next, a solution of the product from step f) (406 mg, 1.43 mmol) in CH2Cl2 (3 ml) was added dropwise to the AlCl3/borane solution. After 2 hours at 0° C., the crude reaction mixture was poured into cold 10% HCl, treated with 2 M NaOH to pH 12 and extracted with CH2Cl2 (3×75 ml). The combined organic extracts were washed with brine (75 ml) and dried (MgSO4). The solvent was evaporated in vacuo and the crude product was purified by silica-gel chromatography using a ethyl acetate/hexanes gradient (0% to 75% ethyl acetate) to give 279 mg (73%) of the subtitle compound. MS calculated for C17H19NS+H 270, observed 270.
