Providing a method of preparing (3R,4R)-3-hydroxy-4-hydroxymethyl-4-butanolide conveniently and selectively from a widely available raw material in a high yield. A carbonyl group of the 2-position of levoglucosenone is reduced to obtain a hydroxyl group of a .beta.-configuration. Then, an iodo-group of an .alpha.-configuration and an acyloxy ion of a .beta.-configuration are introduced regioselectively and stereoselectively to the double bond at the 4-position and the 3-position of the above-mentioned levoglucosenone, respectively, keeping a trans stereochemical relationship. An alkoxide is then formed, by hydrolysis and an oxirane ring of a .beta.-configuration is formed by removing an iodo-group by intramolecular nucleophilic displacement reaction of the alkoxide. After the hydroxyl group of the 2-position is oxidized to convert to a carbonyl group, the oxirane ring is reductively and selectively cleaved, thereby obtaining a chemical compound having no substituent at the 3-position and a hydroxyl group of a .beta.-configuration at the 4-position. Finally a lactone of 5-membered-ring is prepared by subjecting the above-obtained compound to Baeyer-Villigar oxidation.
提供一种方便且高产的方法,从广泛可得的原料中选择性地制备(3R,4R)-3-羟基-4-羟甲基-4
-丁内酯。将
木糖酮的2位上的羰基还原为β构型的羟基。然后,选择性地和立体选择性地在上述
木糖酮的4位和3位双键处引入α构型的
碘基和β构型的酰氧离子,保持反式构象关系。然后通过
水解形成一个烷氧基,通过去除烷氧基的
碘原子的分子内亲核置换反应形成一个β构型的环氧环。将2位上的羟基氧化为羰基后,通过还原性选择性裂解环氧环,从而获得一个在3位上没有取代基且在4位上有一个β构型的羟基的化合物。最后,通过对上述化合物进行拜耳-维利格氧化反应,制备出一个5元环内酯。