Boron trifluoride etherate → 5-(Hydroxymethyl)-3-(2-propyn-1-yl)-2(3H)-thiazolone

Participants

Reaction Steps

A solution of 8.44 g of the product of Step B in 100 ml of toluene was cooled to -65° C. to -70° C. and 5.6 g of boron trifluoride etherate were added. The mixture was stirred for 30 minutes and 200 ml of a 1.2M solution of diisobutyl aluminium hydride in toluene were introduced over 2 hours 15 minutes. Stirring was carried out for a further 30 minutes and the mixture was poured into 1.5 l of a M solution of potassium and sodium tartrate. After stirring for one hour and decanting, extraction was carried out with ethyl acetate. The extracts were washed with water saturated with sodium chloride, dried and brought to dryness. The residue was chromatographed and elution with a hexane-chloroform-acetone mixture (6-2-2) yielded. 2.33 g of the expected product melting at 97° to 98° C.

Provenance & Evidence