A new method for the conversion of secondary and tertiary amides to bridged orthoesters
作者:AndréB. Charette、Peter Chua
DOI:10.1016/s0040-4039(97)10310-0
日期:1997.12
Secondary and tertiary amides were treated with trifluoromethanesulfonic (triflic) anhydride in the presence of pyridine at low temperatures to generate imino and iminium triflates. Successive treatment with 2,2-bishydroxymethyl-1-propanol in the pyridine buffered solution gave the corresponding 2,6,7-trioxabicyclo[2.2.2]octane orthoesters in good to excellent yields at below room temperature.
在吡啶存在下,在低温下用三氟甲磺酸(三氟甲磺酸)酐处理仲酰胺和叔酰胺,以生成亚氨基和亚氨基三氟甲磺酸酯。在吡啶缓冲溶液中用2,2-二羟甲基-1-丙醇连续处理,得到相应的2,6,7-三氧杂双环[2.2.2]辛烷原酸酯,在低于室温下的收率很好。