2,6-Lutidine → (+/-)-3-Methoxy-5,6,9,10,11,12,13,13a-octahydroisoquino[2,1-g][1,6]naphthyridin-8-one

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A solution of 27.3 Kg of 2,4-dioxo-9-methoxy-1,2,3,4,6,7-hexahydro-11bH-benzo[a]quinolizine, 19.6 Kg of 3-bromopropylamine hydrobromide and 22.8 Kg of 2,6-lutidine in 70 litres of n-butanol was refluxed for 1 hour. Butanol and excess 2,6-lutidine were removed under reduced pressure, and the solid residue dissolved in 150 litres of methanol at reflux temperature. The temperature was maintained above 70° C. while 150 litres of water was added. The mixture was cooled to 10° C., the precipitate filtered off and washed with 1:1 aqueous methanol. This product was recrystallized from a mixture of 150 Kg of methanol and 175 Kg of water. Drying under vacuum at 80° C. for three days gave 17.9 Kg of (±)-3-methoxy-5,6,9,10,11,12,13,13a-octahydroisoquino[2,1-g][1,6]naphthyridin-8-one, m.p. 202°-205° C.

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