The photolabile NPPOC group has been successfully introduced into the 6-position of various glycopyranosides in 91–97% yield. Glycosylation of NPPOC-protected phenyl β-D-thiogluco- and galactopyranosides with appropriate acceptors afforded the corresponding disaccharides in good yield. Excellent β-stereoselectivity (β/α≥ 10/1) can be obtained when the glycosylation was realized in CH3CN at −40 °C. Furthermore, the 6-O-NPPOC thioglucoside 6 can also be readily converted into the corresponding glucopyranose or glucosyl fluoride. The photolysis of 6-O-NPPOC diacetone D-galactose 4 has been studied by UV–vis absorption in CH3CN in the presence of water or DBU at 365 nm. At 100 µM concentration, photocleavage of 4 was accomplished after 5 min irradiation, with t1/2 = 37 s (10% water), 75 s (1 equiv. DBU) or 87 s (0.05 M DBU). The formation of the nitroso byproduct can be avoided in the presence of 0.05 M DBU. All the NPPOC-protected mono- or disaccharides can be readily removed by photolysis at 365 nm in CH3CN the presence of water or DBU in more than 87% yield.
                                    光敏性N
PPOC基团成功引入到各种糖
吡喃苷的6位,以91–97%的产率合成。用适当的受体对N
PPOC保护的苯基β-D-
硫葡萄糖苷和半
乳糖苷进行糖苷化反应,可以良好产出相应的二糖。在−40 °C的CH3CN中进行糖苷化反应时,获得了优良的β立体选择性(β/α≥ 10/1)。此外,6-O-N
PPOC
硫葡萄糖苷6也可以方便地转化为相应的
葡萄糖吡喃糖或
葡萄糖基
氟化物。对6-O-N
PPOC
二乙酮D-半乳糖4的光解研究显示,在CH3CN中存在
水或
DBU的条件下,在365 nm照射下进行。以100 µM的浓度,在5分钟的照射后实现了对4的光裂解,半衰期分别为37秒(10%
水)、75秒(1当量
DBU)或87秒(0.05 M 
DBU)。在0.05 M 
DBU存在的情况下,可以避免亚硝基副产物的形成。所有N
PPOC保护的
单糖或二糖都可以通过在CH3CN中以365 nm的波长光解,并在
水或
DBU存在下去除,产率超过87%。