Regioselective acetal-bond cleavage of 4,6-O-benzylidene-and 4,6-O-(4-methoxybenzylidene)-α-d-altropyranosides by DIBAL or Li(C2H5)3BH–TiCl4 is described. The sense of regioselectivity could be controlled by suitable choice of the protecting group of hydroxyl function at C-3. Reduction of 4,6-O-alkylideneglucopyranosides by DIBAL is also examined.
描述了使用D
IBAL或Li(
C2H5)3BH–TiCl4对4,6-O-苄叉-和4,6-O-(4-甲氧基苄叉)-α-d-altropyranosides进行区域选择性的醚键断裂。区域选择性的方向可以通过合适选择C-3羟基功能的保护基团来控制。还研究了使用D
IBAL对4,6-O-烷基叉
葡萄糖吡喃糖的还原。