7-[(6-ethyl-2-phenyl-piperidin-3-ylamino)-methyl]-6-methoxy-1-methyl-3,4-dihydro-1H-[1,5]naphthyridin-2-one → 7-[(6(S)-ethyl-2(S)-phenyl-piperidin-3(S)-ylamino)-methyl]-6-methoxy-1-methyl-3,4-dihydro-1H-[1,5]naphthyridin-2-one

Participants

Reaction Steps

By a procedure similar to the previous example 74: starting with cis-2-phenyl-3-amino-trans-6-ethyl-piperidine (scheme J) and 2-methoxy-5-methyl-6-oxo-5,6,7,8-tetrahydro-[1,5]naphthyridine-3-carbaldehyde (Example 74, step 5) and using the above coupling procedure (Example 74, step 6) 7-[(6-ethyl-2-phenyl-piperidin-3-ylamino)-methyl]-6-methoxy-1-methyl-3,4-dihydro-1H-[1,5]naphthyridin-2-one was obtained. Using a CHIRALPAK AD (10×50 cm) and a mobil phase of 95:5 heptane/ethanol containing 0.025% diethyl amine (flow rate=275 ml/min) 7-[(6(S)-ethyl-2(S)-phenyl-piperidin-3(S)-ylamino)-methyl]-6-methoxy-1-methyl-3,4-dihydro-1H-[1,5]naphthyridin-2-one (retention time 13.545 min) was isolated as a pure enantiomer. 1H NMR (CDCl3) δ 7.40 (m, 2H), 7.35 (m, 2H), 7.2 (m, 1H), 4.20 (s, 1H), 3.75 (s, 3H), 2.82, 2.42 (d,d, 2H), 3.17 (s, 3H), 3.08 (m, 1H), 2.90 (m, 2H), 2.85 (m, 1H), 2.65 (m, 2H), 1.8–2.2 (m, 6H), 1.7 (m, 1H), 1.55 (m, 1H), 1.38 (m, 1H), 0.9 (t, 3H). Mass spectrum: m/e=409.2 (p+1). The corresponding 7-[(6(R)-ethyl-2(R)-phenyl-piperidin-3(R)-ylamino)-methyl]-6-methoxy-1-methyl-3,4-dihydro-1H-[1,5]naphthyridin-2-one enantiomer (retenton time 14.539 min) was also isolated. NMR and mass spectrum was identical to the above spectra.

Provenance & Evidence