A first example of catalytic ylide epoxidation reaction: facile synthesis of vinyl epoxides from aldehydes catalyzed by diisobutyl telluride
作者:Zhang-Lin Zhou、Shi Li-Lan、Yao-Zeng Huang
DOI:10.1016/s0040-4039(00)97324-6
日期:1990.1
presence of cesium carbonate, a variety of aldehydes can be epoxidized directly with allyl bromide at 50°C under solid-liquid phase transfer condition by use of a catalytic amount of diisobutyl telluride to afford vinyl epoxides in good yields with predominant cis stereoselectivity.
In the presence of solid KOH, allyldi-isobutyltelluroniumbromide 2 reacts directly with aromatic aldehydes at room temperature under solid–liquid phase-transfer conditions to afford α,β-unsaturatedepoxides 3 in excellent yields.