Methanol → (+/-)-4-[N-{(3RS,4RS)-N,3-Dimethyl-4-piperidinyl}phenylamino]-N,N-diethylbenzamide

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Reaction Steps

(±)-2,6-Di-tert-butyl4-methoxyphenyl4-[N-{(3RS,4RS)-N,3-dimethyl4-piperidinyl}phenylarino]benzoate (6b) (7.38 g, 13.62 mmol) was transesterified with sodium methoxide (135 mmol) in toluene (150 mL) and NMP (40 mL) and then hydrolyzed with MeOH and H2O (12:1, 165 mL) as before. The resulting acid was dissolved in THF (200 mL) with triethylamine (5 mL), diethylamine (2 mL), and BOP reagent (6.1 g, 13.80 mmol) as above. Work-up and chromatography on silica gel as above afforded 7b (3.02 g, 59%) as a yellow liquid. Conversion to the hydrochloride salt was done with 1 N HCl in ether. 1H NMR (CD3OD) δ 1.10-1.25 (m, 12H), 1.76-2.28 (s, 3H), 2.99 (t, 1H, J=12.5 Hz), 3.12-3.29 (m, 1H), 3.31-3.58 (m, 7H), 4.12-4.29 (m, 1H), 6.78 (d, 2H, J=8.8 Hz), 7.18 (d, 2H, J=7.3 Hz), 7.22 (d, 2H, J=8.8 Hz), 7.33 (t, 1H, J=7.4 Hz), 7.48 (t, 2H, J=7.5 Hz); 13C NMR (CD3OD) δ 16.1, 29.0, 35.3, 43.8, 55.3, 58.7, 60.7, 116.9, 127.3, 127.8, 129.1, 130.7, 131.2, 144.0, 152.0, 173.9. Anal. (C24H34ClN3O.1.25H2O): C, H, N.

Provenance & Evidence