But-3-en-2-yl glycosides have been obtained by glycosidase-catalysed transformations under thermodynamic conditions, and reaction parameters have been optimised. It has been shown that the enzymes can be immobilised on non-ionic Amberlite resin (XAD-4) and can conveniently be retrieved and re-used in a subsequent glycosylation. The enzyme-catalysed reactions display some diastereodifferentiation with a preference for the (R)- over the (S)-alcohol. An increase in size of the aliphatic substituent on the allyl alcohol gives a significant improvement of diastereoselection.
通过糖苷酶催化的转化在热力学条件下获得了But-3-en-2-yl糖苷,并优化了反应参数。研究表明,酶可以固定在非离子型Amberlite
树脂(XAD-4)上,并且可以方便地在后续的糖苷化反应中回收和重用。酶催化的反应显示出一定的差向选择性,优先生成(R)-而非(S)-醇。当
烯丙醇上的脂肪族取代基增大时,差向选择性显著提高。