[reaction: see text] Dihydroxylation of delta- and epsilon-mesyloxy alpha,beta-unsaturated esters proceeds with in situ cyclization to afford 2,5-disubstituted and 2,3,5-trisubstituted tetrahydrofurans.
[反应:见正文]δ-和ε-
甲磺酰氧基α,β-不饱和酯的二羟基化与原位环化进行,得到2,5-二取代和2,3,5-三取代的
四氢呋喃。