cis-3,5-Cyclohexadiene-1,2-diol derivatives: facial selectivity in their Diels–Alder reactions with ethylenic, acetylenic and azo dienophiles
作者:Sunny M. Ogbomo、D. Jean Burnell
DOI:10.1039/b607938e
日期:——
The Diels-Alderreactions of maleimide with the acetonide derivative (6a) of cis-3,5-cyclohexadiene-1,2-diol (1a) in various solvents showed facial selectivities ranging from 1 : 1 to 1 : 9. The same derivative 6a reacted in benzene with ethylenic dienophiles with generally modest facial selectivity, but acetylenic dienophiles added exclusively anti to the oxygen functions of 6a. Dimerization of cyclic
Synthesis of Bicyclo[2.2.2]octane-2,3,5,6,7,8 hexols (Bishomoinositols) as Glycosidase Inhibitors
作者:Arif Baran、Aslihan Günel、Metin Balci
DOI:10.1021/jo800553u
日期:2008.6.1
the construction of the bicyclo[2.2.2]octane skeleton, 2,2-dimethyl-3a,7a-dihydro-1,3-benzodioxole was reacted with vinylene carbonate to give two isomeric cycloadditon products having the bicyclo[2.2.2]octane skeleton. Hydrolysis of the ketal ring and the opening of the carbonate functionality, followed by hydroxylation of the remaining double bond resulted in the formation of a symmetrical hexol.