A new approach to A,B-difunctionalisation of cyclodextrins using bulky 1,3-bis[bis(aryl)chloromethyl]benzenes as capping reagents
作者:Dominique Armspach、Laurent Poorters、Dominique Matt、Belkacem Benmerad、Fadila Balegroune、Loic Toupet
DOI:10.1039/b504012d
日期:——
1,3-Bis[bis(4-tert-butylphenyl)chloromethyl]benzene and 1,3-bis[bis(4-anisyl)chloromethyl]benzene were employed as regioselective capping reagents for the preparation of C-6A,C-6B-bridged, permethylated α- and β-CD derivatives; isolated yields up to 55% of proximally capped, methylated CDs were obtained, thus opening the way to the straightforward preparation of a wide range of A,B-functionalised CDs. As revealed by a single crystal X-ray diffraction study, the benzene-1,3-bis[bis(4-tert-butylphenyl)methyl] spacer is perfectly suited for A,B-capping of β-cyclodextrin.
采用 1,3-双[双(4-叔丁基苯基)氯甲基]苯和 1,3-双[双(4-甲氧基苯基)氯甲基]苯作为区域选择性封端试剂,制备了 C-6A、C-6B 桥接、过甲基化的 α-CD 和 β-CD 衍生物;获得的近端封端甲基化 CD 的分离产率高达 55%,从而为直接制备广泛的 A,B 功能化 CD 开辟了道路。单晶 X 射线衍射研究表明,苯-1,3-双[双(4-叔丁基苯基)甲基]间隔物非常适合用于 A,B-β-环糊精的封端。