Ring-opening of chiral glycidol or glycidyl tosylate by Me3SiN3 or Me3SiCN catalyzed by Ti(O-i-Pr)4 or Al(O-i-Pr)3 occured in a regiospecific manner and with very high stereoselectivity, leading to new trifunctionalized chiral building blocks. The enantiomeric excess of the ring-opened products was 90−95 %, as determined by 1H NMR of the Mosher ester derivatives, indicating that there was not significant
Ti(O- i- Pr)4或Al(O- i- Pr)3催化的Me 3 SiN 3或Me 3 SiCN催化手性
缩水甘油或甲
苯磺酸缩水甘油酯的开环反应是区域特异性的,并且立体选择性很高,导致新的三功能手性构建基块。通过Mosher酯衍
生物的1 H NMR测定,开环产物的对映体过量为90-95%,这表明在开环过程中光学纯度没有明显降低。该方法用于在94%ee(丙
醇类似物的前体)中一锅合成(R)-1-
叠氮基-3-
萘氧基-2-羟基
丙烷。