Methanesulfonyl chloride → Diisopropylamine

Participants

Reaction Steps

Compounds of formula (50), wherein R4 and R5 are as defined in formula (I) and R6 is aryl or heteroaryl, can be prepared as described in Scheme 6. Ethyl 7-methoxy-2-methyl-3-quinolinecarboxylate can be prepared using the procedures described in Synthetic Comm., 17(14):1647-1653 (1987). Ethyl 7-methoxy-2-methyl-3-quinolinecarboxylate can be treated with a reducing agent, such as, but not limited to, lithium aluminum hydride or sodium borohydride, to provide (7-methoxy-2-methyl-3-quinolinyl)methanol. (7-Methoxy-2-methyl-3-quinolinyl)methanol can be treated with a chlorinating reagent, such as, but not limited to, thionyl chloride to provide 3-(chloromethyl)-7-methoxy-2-methylquinoline. 3-(Chloromethyl)-7-methoxy-2-methylquinoline can be treated with sodium cyanide or potassium cyanide to provide (7-methoxy-2-methyl-3-quinolinyl)acetonitrile. (7-Methoxy-2-methyl-3-quinolinyl)acetonitrile can be treated with acid, such as, but not limited to, glacial acetic acid and concentrated sulfuric acid, in water and 1,4-dioxane with heat to provide (7-methoxy-2-methyl-3-quinolinyl)acetic acid. (7-Methoxy-2-methyl-3-quinolinyl)acetic acid can be treated with a reducing agent, such as, but not limited to, B2H6, borane-THF complex, or borane-pyridine complex, to provide 2-(7-methoxy-2-methyl-3-quinolinyl)ethanol. 2-(7-Methoxy-2-methyl-3-quinolinyl)ethanol can be treated with methanesulfonyl chloride and a base, such as, but not limited to, triethylamine or diisopropylamine to provide 2-(7-methoxy-2-methyl-3-quinolinyl)ethyl methanesulfonate. 2-(7-Methoxy-2-methyl-3-quinolinyl)ethyl methanesulfonate can be treated with an amine of formula (5) to provide amines of formula (47). Amines of formula (47) can be treated with BBr3 to provide hydroxy compounds of formula (48). Hydroxy compounds of formula (48) can be treated with trifluoromethanesulfonic anhydride or trifluoromethanesulfonyl chloride to provide triflates of formula (49). Triflates of formula (49) can be treated with boronic acids of formula (7) as described in Scheme 1 to provide compounds of formula (50).

Provenance & Evidence