150, where a yield of >83% was obtained. The overall yields of the five-step procedure to 1,4-dideoxy-1,4-imino-l-lyxitol and 1,4-dideoxy-1,4-imino-d-lyxitol were 57% and 50%, respectively. This synthetic procedure has several advantages such as competitive overall yield, reduced number of steps, and mild reaction conditions. Furthermore, the zeolite catalyst can be easily recovered from the reaction
由相应的d糖合成羟基
吡咯烷,1,4-dideoxy-1,4-imino-l-lyxitol和1,4-dideoxy-1,4-imino-d-lyxitol的关键步骤是合成O-甲基2,3-O-异亚丙基
戊烯呋喃糖酶。人们发现,采用
沸石的多相催化可直接用于由d-糖直接合成O-甲基2,3-O-异亚丙基
戊二酸呋喃糖酶,而不是采用传统的
无机酸催化剂(如HCl和HClO4)进行均相催化过程,
甲醇和
丙酮在温和的条件下。最好的催化剂是Si / Al摩尔比为150的H-β
沸石,其收率> 83%。对于1,4-二脱氧-1,4-亚
氨基-1-糖醇的五步法的总产率分别为57%和50%。该合成方法具有许多优点,例如具有竞争力的总产率,减少的步骤数和温和的反应条件。此外,可以容易地从反应混合物中回收
沸石催化剂,并在不损失活性的情况下对其进行再利用。