Hydrochloric Acid → 5-[4-(4-Methoxypyridin-3-yl)benzyl]-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline dihydrochloride salt

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Reaction Steps

The synthesis of 5-[4-(4-methoxypyridin-3-yl)benzyl]-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline dihydrochloride salt 45 is shown in Scheme-12. Reaction of compound 38 with 4-methoxypyridine-3-boronic acid 19 in the presence of Palladium (II) acetate, triphenylphosphine, and Na2CO3 in anhydrous 2-propanol yielded 5-[4-(4-methoxypyridin-3-yl)benzyl]-7,8-dihydro-5H-[1,3]dioxolo[4,5-g]isoquinoline-6-carboxylic acid tert-butyl ester 43 which was treated with trifluoroacetic acid in dichloromethane to get 5-[4-(4-methoxypyridin-3-yl)benzyl]-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline trifluoro acetate salt 44. Compound 44 was treated by 37% HCl, 1N NaOH followed by 2M HCl/Ether in MeOH-Ether to obtain 45.

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