Acetic Acid → 6-(7-Hydroxyheptyl)-7-(3-oxo-5-phenylpent-1-enyl)-1,4-dioxaspiro[4,4] nonane

Beteiligte Stoffe

Reaktionsschritte

A solution of dimethyl 2-oxo-4-phenylbutylphosphonate [2.5g; prepared as described hereinafter in Example 9(iv)] in anhydrous tetrahydrofuran (50 ml.) was added to a stirred suspension of sodium hydride (0.24 g.) in tetrahydrofuran (20 ml.). The mixture was stirred at room temperature in an atmosphere of nitrogen for 24 hours, then treated dropwise with a solution of 7-formyl-6-(7-hydroxyheptyl)-1,4-dioxaspiro[4,4]nonane [2.7 g; prepared as described hereinbefore in Example 1(iv)] in tetrahydrofuran (30 ml.) and stirred for a further 2 hours in an atmosphere of nitrogen. The mixture was acidified to pH 4 by the addition of glacial acetic acid, the solvents were removed in vacuo and the residue was extracted with diethyl ether. The ethereal solution was washed with aqueous sodium bicarbonate solution (10% w/v) and then with water and dried over anhydrous magnesium sulphate. Evaporation of the solution gave 6-(7-hydroxyheptyl)-7-(3-oxo-5-phenylpent-1-enyl)-1,4-dioxaspiro[4,4] nonane (3.9 g.), in the form of a yellow oil (νmax 955 cm-1, 990 cm-1, 1625 cm-1, 1665 cm-1, 1690 cm-1).

Herkunft & Nachweise