Enantioselectivity effects in the hydrolytic cleavage of activated substrates with α- and β-cyclodextrins
作者:Roberto Fornasier、Fabiano Reniero、Paolo Scrimin、Umberto Tonellato
DOI:10.1039/p29870000193
日期:——
kinetics of hydrolytic cleavage of the enantiomers of p- and m-nitrophenyl (Np) phenylacetate esters of general structure PhCR1R2–CO2–Np where R1,R2= H,Me [(1), (2)], H,OMe [(3), (4)], or CF3,OMe [(5), (6)], and of the carbonates PhCHMe–OCO2–p-Np (7) and n-C6H13–CHMe–OCO2–p-Np (8), have been measured in the presence of α- and β-cyclodextrins. The rates of intracomplex cleavage were found to be larger
的对映体的水解裂解的动力学p -和米硝基苯基(NP)通式结构的苯乙酸酯PhCR 1 - [R 2 -CO 2 -Np其中R 1,R 2 = H中,Me [(1),(2) ],H,OMe [(3),(4)]或CF 3,OMe [(5),(6)],以及碳酸盐PhCHMe–OCO 2 – p -Np(7)和nC 6 H 13 –CHMe–OCO 2 – p -Np(8),已在存在α-和β-环糊精的条件下进行了测定。物内裂解率被发现是用于较大ř -比对于小号在几乎所有情况下-对映体; 对映体选择性的因素范围从统一到CA。取决于取代基对R 1和R 2的相对大小,图19所示的取代基R 19和R 2的相对大小相同。已经借助分子模型解释了这种作用。