Vanillin → (4R,5R)-2-(3-methoxy-4-hydroxy-phenyl)-4,5-dicarbomethoxy-1,3-dioxolane

Beteiligte Stoffe

Reaktionsschritte

In a fashion similar to that described for Example 3, vanillin and dimethyl L-tartrate were condensed to provide (4R, 5R)-2-(3-methoxy-4-hydroxy-phenyl)-4,5-dicarbomethoxy-1,3-dioxolane, mp 88°-90° C., [α]D25 -35.1° (c,0.1,methanol). 1H-NMR (CDCl3)δ7.20 (1H,d,J=1. 8 Hz), 7.06 (1H,dd,J=1.8 Hz and 8.2 Hz), 6.19 (1H,d,J=8.2 Hz), 6.08 (1H,s), 5.82 (1H, s), 4.96 (1H,d,J=3.8 Hz), 4.85 (1H,d,J=3.8 Hz), 3.91 (3H,s), 3.87 (3H,s), 3.84 (3H,s). IR (film) 3450, 1750, 1600, 1510, 1460, 1430 cm-1. Ms m/e (% abundance) 313(2), 312(12), 253(40), 168(84), 151(100), 124(22), 109(14), 59(18).

Herkunft & Nachweise