Lithium Hydroxide → 3-(Hydroxymethyl)-5-methoxybenzoic acid

Participants

Reaction Steps

In analogy to the procedure described in example 50k), 3-hydroxymethyl-5-methoxy-N-piperidin-4-yl-benzamide [prepared by i) saponification of 3-hydroxymethyl-5-methoxy-benzoic acid methyl ester [Synthetic Communications, 31(12), 1921-1926; 2001] with LiOH in THF/MeOH (2:1) to give 3-hydroxymethyl-5-methoxy-benzoic acid in analogy to the procedure described in example 53; ii) subsequent condensation with 4-amino-piperidine-carboxylic acid tert-butyl ester to give 4-(3-hydroxymethyl-5-methoxy-benzoylamino)-piperidine-1-carboxylic acid tert-butyl ester, using N-(3-dimethylaminopropyl)-N′-ethyl-carbodiimide hydrochloride and N,N-dimethyl-4-aminopyridine in MeCl2 in analogy to the procedure described in example 60d); iii) Boc cleavage with TFA in analogy to the procedure described in example 50i)] was reacted with 3,5-diethoxy-4-fluoro-benzaldehyde (example 50 g), sodium cyanoborohydride, N-ethyl-diisopropylamine and acetic acid in ethanol at 50° C. to yield the title compound as off-white solid. MS: 461.1 (MH+).

Provenance & Evidence