Ethynyltriisopropoxytitanium reactions with pyrimidinones
作者:Frode Rise、David Grace、Kjell Undheim
DOI:10.1016/0022-328x(88)80007-x
日期:1988.1
pyrimidin-2(1H)-ones with exclusive carbon-carbon bond formation at C(6). The products after quenching ethynylmagnesium bromide with chlorotriisopropoxytitanium at −10°C are the mesityl oxide adducts with the pyrimidinones with the new carbon-carbon bond at C(6). Mesityl oxide, as its lithium enolate at −80°C, forms a mixture of the 3,4- and the 3,6-dihydro-isomeric adducts. High resolution NMR was used for the structure
Novel derivatives of pyrimid-2-one having interesting pharmacological properties are described. The compounds of the invention have been found to be of use in the control of, and in particular in the inhibition of the metaphase of malignant tumours and leukaemias. Processes for the preparation of the novel compounds and pharmaceutical compositions containing them are also described.
Aryl- and alkynyltri-isopropoxytitanium reagents in regioselective carbon-carbon bond formation in azines
作者:Lise-Lotte Gundersen、Frode Rise、Kjell Undheim
DOI:10.1016/0040-4020(92)80015-8
日期:1992.7
results from 1:1-adduct formation between an aryltriisopropoxytitanium reagent and N-isobutyloxycarbonyl- or an N-silyloxymethyl-3-cyanopyridinium salt after successive DDQ dehydrogenation and cleavage of the 1-substituent. Complete regioselectivity for new CC bondformation in the 4-position results in the adduct formation between aryl- and phenylethynyltri-isopropoxytitanium reagents and pyrimidin-2(1H)-ones;
Sodium 2-mercaptoethanesulfonate (MESNA, coenzyme M) forms 1:1 covalent adducts with highly pi-electron deficient heterocycles. The addition is caused by the thiol function, and the adducts become water soluble as sulfonates. 1H NMR spectroscopy has been used to obtain information about electronic and steric effects on the equilibria between 2-pyrimidinones and their 1:1 MESNA adducts. The adducts are potential prodrugs for biologically interesting 2-pyrimidinones.
RISE, FRODE;UNDHEIM, KJELL, ACTA CHEM. SCAND., 43,(1989) N, C. 489-492