An alkynyl group having a triple bond at the carbon atom at the 1-position is introduced to a carbon atom at the 1-position of 2,3-O-isopropylidene-D-ribofuranose. The diol part is then cleaved to obtain a lactol compound. This lactol compound is oxidized to obtain a lactone compound. The ketal part of the lactone compound is hydrolyzed and the compound is further subjected to a reduction reaction. The hydroxyl groups at the 2- and 3-positions are then eliminated, and the double bond between the 2- and 3-positions of the resultant compound is reduced to obtain a 4-substituted-.gamma.-lactone.
在2,3-O-异丙基-
D-核糖酮的1位碳原子上引入一个三键键的炔基基团。然后裂解二醇部分,得到内酯化合物。将这种内酯化合物氧化,得到内酯化合物。内酯化合物的
缩酮部分
水解,然后进一步进行还原反应。然后消除2位和3位的羟基,将所得化合物的2位和3位之间的双键还原,得到4-取代的γ-内酯。