Benzyl bromoacetate → Benzyl 2-hydroxyacetate

Beteiligte Stoffe

Reaktionsschritte

To a mixture of pentanoracid 7 (600 mg; 1.2 mmol), silver carbonate (440 mg; 1.6 mmol) in a mixture of chloroform (10 ml) and acetonitrile (7 ml), benzyl bromacetate (260 μl; 1.6 mmol) was added and the reaction mixture was stirred for 28 hours at room temperature. The course of the reaction was monitored by TLC (toluene/diethyl ether 6:1). The reaction mixture was then filtered through diatomaceous earth and the filtrate was worked-up and the product was purified by analogical procedure as in the preparation of 21-oxoacid benzyl glycolate. The obtained crude pentanoracid benzyl glycolate (358 mg; 46%) having m.p. 156-157° C. (methanol), [α]D=+57° (c=0.31) was used in the next step.

Herkunft & Nachweise