反应详情

A suspension of (1R)-1-({4-[(1,2,3-benzothiadiazol-5-ylmethyl)amino]-1-piperidinyl}methyl)-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione dihydrochloride (for a preparation see Example 5A(j)) (50 mg, 0.134 mmol) in chloroform (2 ml) and methanol (0.100 ml) at rt under argon was treated with triethylamine (0.056 ml, 0.402 mmol) and stirred at rt for 15 min. The solution was then treated with 8-fluoro-2,3-dihydro-1,4-benzodioxin-6-carbaldehyde (for a synthesis see WO2007122258, Example 8(b)) (21.96 mg, 0.121 mmol) and stirred for a further 30 min. The solution was treated with sodium triacetoxyborohydride (85 mg, 0.402 mmol) and stirred at rt for 30 min, LCMS after 30 min showed there was still starting material and the imine of the product. So more sodium triacetoxyborohydride (40 mg) was added, the reaction was stirred for a further 30 min. LCMS after this time showed that the reaction was complete. The reaction was then treated with saturated aqueous NaHCO3 (10 ml) and extracted with 20% methanol/DCM (3×25 ml). The combined organic fractions were dried (MgSO4), filtered, evaporated and chromatographed (0-20% methanol/DCM) to give the free base of the title compound (6 mg, 9.6%) as a pale yellow solid and some crude product (15 mg, 24%) as an impure pale yellow solid which was purified using an SCX column to give more identical title compound, free base.

1. stirringstirred for a further 30 min
2. stirringstirred at rt for 30 min
3. waitLCMS after 30 min showed
4. stirringthe reaction was stirred for a further 30 min
5. extractionextracted with 20% methanol/DCM (3×25 ml)
6. dry with materialThe combined organic fractions were dried (MgSO4)
7. filtrationfiltered
8. customevaporated
9. customchromatographed (0-20% methanol/DCM)