Fluorine-containing optically active allylic alcohols: preparation and Claisen rearrangement as a new entry to highly functionalized fluorinated amino alcohol derivatives
作者:Sheng Peng、Feng-Ling Qing
DOI:10.1039/a906263g
日期:——
active allylic alcohol 2 in 65% yield with a diastereomeric excess greater than 98%. The treatment of Garner aldehyde 1 with CF3CFBr2 (3a) and CF3CCl3 (3b) in the presence of zinc powder and catalytic AlCl3 highly diastereoselectively afforded 4a and 4b, respectively, in moderate yield. The orthoester Claisen rearrangement of 4a, b and 2 provided a new way to highly functionalized amino alcohol derivatives
Garner醛1与2-溴-3,3,3-三氟丙烯在Zn-Ag对存在下的反应以65%的收率得到了含氟光学活性烯丙基醇2,非对映体过量大于98%。在锌粉和催化的AlCl 3存在下,用CF 3 CFBr 2(3a)和CF 3 CCl 3(3b)处理加纳醛1分别以中等收率选择性地得到4a和4b。4a,b和2的原酸酯克莱森重排为含有限数量的氟原子的高度官能化的氨基醇衍生物6a-f提供了新途径。