Sodium Carbonate → (3S,7S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-1-methyl-2-oxo-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carboxylic acid methyl ester

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Reaction Steps

(3S,7S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-1-methyl-2-oxo-1,2,3,5,7,8-hexahydro-4-oxa-1,6-diaza-anthracene-6,7-dicarboxylic acid 6-tert-butyl ester 7-methyl ester (4.2 g) was deprotected following general procedure C. The hydrochloride salt was treated with 10% sodium carbonate and EtOAc. The aqueous layer was washed with EtOAc and the organic layers combined. The organic layers were dried over sodium sulfate and concentrated to provide (3S,7S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-1-methyl-2-oxo-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carboxylic acid methyl ester (3.4 g). LC-MS (m/z) 528. NMR (400 MHz, CDCl3): 7.51 (d, 1H), 7.44 (d, 1H), 7.29 (m, 2H), 7.23 (m, 1H), 7.68 (m, 2H), 6.69 (s, 1H), 6.68 (s, 1H), 5.64 (s, 1H), 4.97 (s, 2H), 4.03 (m, 2H), 3.79 (s, 3H), 3.73 (m, 1H), 3.40 (s, 3H), 3.09-2.90 (m, 2H).

Provenance & Evidence