2,3-Butanediol → 2-Methoxy-4,5-dimethyl-1,3,2-dioxaphospholane

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 300 g of trimethyl phosphite and 200 ml of 2,3-butanediol was heated to 100° C. and the methanol formed was distilled off to obtain 170 g of 2-methoxy-4,5-dimethyl-1,3,2-dioxaphospholane with a boiling point of 66° C. at 20 mm Hg, 37 g of the said product were added over two hours to 62.5 g of tert.-butyl bromoacetate heated to 115° C. under reduced pressure of 140 mm Hg and the volatile products were removed under reduced pressure to obtain 59 g of 2-tert.-butoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane which slowly crystallized.

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