反应 #3177589
相关文献 (1)
openreactiondata ↗doi:10.6084/m9.figshare.5104873.v1; patent:US05712281
反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
实验步骤: When n is the bridging group --C(CH3)2 --, an appropriately substituted or unsubstituted phenyl methyl ketone, for example, methyl (3-chlorophenyl) ketone, is prepared by the reaction of methylmagnesium bromide and an appropriate benzonitrile in tetrahydrofuran. The ketone is in turn treated with methylmagnesiun bromide in tetrahydrofuran, yielding the corresponding 2-phenylpropan-2-ol, which is then converted to the 2-bromo-2-phenylpropane by the treatment of the alcohol with lithium bromide and trimethylsilyl chloride in acetonitrile. The Grignard reagent of the 2-bromo-2-phenylpropane is then prepared and reacted with 1,4-cyclohexanedione mono-ethylene ketal in tetrahydrofuran, yielding the corresponding 1-(2-phenylpropan-2-yl)-1-cyclohexen-4-one. The so-prepared cyclohexenone is reduced with hydrogen gas in the presence of 10% palladium on charcoal, yielding the 4-(2-phenylpropan-2-yl)cyclohexanone, which is in turn reacted with cyanoguanidine, as previously described, yielding the targeted 2,4-diamino-6-(2-phenylpropan-2-yl)-5,6,7,8-tetrahydroquinazoline. Example 7 provides a detailed description of how this reaction is conducted.
来源 ID: ord-85879805e0b749a0bc0f0591a5f9faba