Regioselectivities in the reactions of the three contiguous free hydroxy groups at C-6, C-1, and C-2 of 3,4,5-tri-O-benzyl-D-myo-inositol have been examined. Stannylene activation permits selective alkylation and esterification at C-1; however, acyl migration back and forth between C-1 and C-2 leads to unpredictable ratios of the isolated regioisomers. With the stable C1-alkylated products, further alkylation is regioslective for the axial C-2–OH, whereas acylation is regioselective for the equatorial C-6–OH. In most cases the ‘other’ regioisomer is not observed, the by-products being those of dialkylation or diacylation.
已对3,4,5-三-O-
苄基-D-myo-肌醇在C-6、C-1和C-2的三个相邻游离羟基的反应中的区域选择性进行了研究。
锡烯的激活使得在C-1进行选择性烷基化和
酯化成为可能;然而,C-1和C-2之间的酰基迁移前后导致所得到的区域异构体比例不可预测。在稳定的C1-烷基化产物中,进一步的烷基化对此轴向的C-2–OH具有区域选择性,而酰基化则对赤道的C-6–OH具有区域选择性。在大多数情况下,‘其他’区域异构体未被观察到,副产物为双烷基化或双酰基化的产物。