A facile one-pot synthesis of 2,3,6-trisubstituted pyridine derivatives from bicyclic ketal by using TMSOMs (5 equiv.)-BF3·Et2O (1 equiv.)
作者:Jong-Gab Jun、Tae Hee Ha、Dae-Whang Kim
DOI:10.1016/0040-4039(94)88032-8
日期:1994.2
TMSOMs (5equiv.)-BF3·Et2O (1equiv.) complex was studied for the selective cleavage of bicyclicketal and a useful method was found for the preparation of 2,3,6-trisubstitutedpyridine in good yield. The bicyclicketal was cleaved and rearranged to 1,5-diketone which was then reacted with nitrile affording pyridine as a sole product in one-flask.
Selective, one-pot synthesis of 2,3,6-trisubstituted pyridine and 2-cyclohexen-1-one derivatives from bicyclic ketals
作者:Jong-Gab Jun、Tae Hee Ha
DOI:10.1002/jhet.5570340151
日期:1997.1
Boron difluoromethanesulfonate, prepared from 5 equivalents of trimethylsilyl methanesulfonate and 1 equivalent of borontrifluoride etherate, has proved to be an active Lewis acid catalyst for the one-pot transformation reaction of bicyclic ketals in the 6,8-dioxabicyclo[3.2.1]octane series to 2,3,6-trisubstituted pyridine or 2-cyclohexen-1-one selectively, depending on conditions. A 1,5-diketone