Sodium → HCID 21467991, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Sodium metal, 4.1 grams (0.18 mole), was stirred with 250 mL of ethanol for 30 minutes. After this time 20.0 grams (0.08 mole) of 2,4-diamino-5-iodo-6-methylpyrimidine (prepared in Step B of Example 3), 27.6 grams (0.11 mole) of trans-3-methyl-3-(4-trifluoromethylphenyl)-1-butenylboronic acid, and 9.2 grams (0.008 mole) of tetrakistriphenylphosphine palladium(0) were added. The reaction mixture was purged with nitrogen, and then heated to 80° C. where it stirred for about 28 hours. After this time the reaction mixture was concentrated under reduced pressure to about 20% of the original volume and then poured into 300 mL of water. The mixture was cooled in an ice-bath, and a solid was collected by filtration. The solid was triturated with a mixture of 1:1 petroleum ether:diethyl ether, and then subjected to column chromatography on silica gel using 5% methanol in methylene chloride as the eluant. The product-containing fractions were combined and concentrated under reduced pressure to a solid residue. The solid was recrystallized from 1-propanol and water, yielding 15.2 grams of trans-2,4-diamino-6-methyl-5-[3-(4-trifluoromethylphenyl)-3-methyl-1-butenyl]pyrimidine, mp 182°-185° C. The NMR spectrum was consistent with the proposed structure.

Herkunft & Nachweise