HCID 178469475, compound → HCID 178469472, compound

Participants

Reaction Steps

The starting material is prepared as follows: Ethyl 6-benzyloxycarbonyl-4-hydroxy-5,6,7,8-tetrahydro[1,6]naphthyridine-3-carboxylate (Example 1i) is hydrogenated with palladium on carbon as the catalyst in glacial acetic acid to obtain ethyl 4-hydroxy-5,6,7,8-tetrahydro[1,6]naphthyridine-3-carboxylate, which is treated with benzyl bromide in a mixture of triethylamine and DMF at 60° for 48 hr to obtain ethyl 6-benzyl-4-hydroxy-5,6,7,8-tetrahydro[1,6]naphthyridine-3-carboxylate. Treatment of this material with an excess of phosphorous oxychloride at reflux for 5 hr affords the required ethyl 6-benzyl-4-chloro-5,6,7,8-tetrahydro[1,6]naphthyridine-3-carboxylate.

Provenance & Evidence