Bromide ion → 3-(4-Bromobutyl)-5,5-dimethyl-4-thiazolidinone

Participants

Reaction Steps

To a -75° C. (CO2 /isopropanol bath) mixture of lithium bis(trimethylsilyl)amide and tetrahydrofuran (102 mL) under nitrogen was added a 0° C. solution consisting of 3-(4-bromobutyl)-4-thiazolidinone (11.65 g), iodomethane (20.8 g) and tetrahydrofuran (20 mL) over a period of 20 min. The resultant solution was stirred at -75° C. for 25 min. TLC analysis (silica gel, 32% EtOAc/hexane) of a small aliquot acidified with 1N HCl showed the absence of a starting bromide and the presence of a major product, Rf ≅0.41. The reaction mixture was removed from the cold bath and acidified with 1N HCl (200 mL). The aqueous mixture was extracted with diethyl ether (3×175 mL). The combined extracts were washed with brine (200 ml), dried over Na2SO4 and concentrated in vacuo to an oil. The crude oil was chromatographed (Waters Prep 500, 2 silica gel columns, 30% EtOAc/hexane) to give 11.02 g of an oil as the major product, Rf ≅0.41. A sample (2.80 g) of this was distilled using a short path head yielding 2.68 g of a faint yellow oil (bath temperature 90°-100° C./0.05 mm Hg).

Provenance & Evidence