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
A Facile One-Pot Synthesis of<i>cis</i>1,2-Cyclopentanediol from Bicyclic Ketal
作者:Jong-Gab Jun、Hyun Shun Shin
DOI:10.1080/00397919308011288
日期:1993.7
Abstract Newmethod for one-pot preparation of cis 1,2-cyclopentanediols frombicyclicketals in the 6,8-dioxabicyclo[3.2.1]octane series is described. Bicyclicketals are refluxed for 1h with AlCl3 (3eq.) in AcOH and further refluxed for 60h after addition of Zn(8eq.) to give cis 1,2-cyclopentanediols in good yield.
A novel one step preparation of 2,6-disubstituted pyridines from bicyclic ketals
作者:Jong-Gab Jun、Hyun Shun Shin
DOI:10.1016/s0040-4039(00)61321-7
日期:1992.8
6,8-Dioxabicyclo[3.2.1loctanes(1) were readily converted to 2,6 disubstituted pyridine derivatives(2) in one step by treatment with AlCl3,-NH2OH·HCl/AcOH.
作者:Michael Bjorklund、Jong Gab Jun、Bradford P. Mundy
DOI:10.1016/s0040-4039(00)98681-7
日期:1985.1
Bicyclic ketals of the 6,8-dioxabicyclo[3.2.1]octane series are specifically cleaved to give δ, ε-unsaturated ketones by treatment of the ketal with acetyl iodide.