Hydrochloric Acid → Ceramide NG

HRID 222840Notes

Reaction equation

[C:1]([NH:20][C@H:21]([C@H:27]([OH:43])[CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH2:33][CH2:34][CH2:35][CH2:36][CH2:37][CH2:38][CH2:39][CH2:40][CH2:41][CH3:42])[C:22](OCC)=[O:23])(=[O:19])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18].[BH4-].[Na+].[Cl-].[Al+3].[Cl-].[Cl-].Cl>O.C1COCC1>[C:1]([NH:20][C@H:21]([C@H:27]([OH:43])[CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH2:33][CH2:34][CH2:35][CH2:36][CH2:37][CH2:38][CH2:39][CH2:40][CH2:41][CH3:42])[CH2:22][OH:23])(=[O:19])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18]

Participants

Conditions

Temperature: 50 °C

Procedure

Ethyl (2R,3R)-2-octadecanoylamino-3-hydroxyoctadecanoate (1.50 g, 2.46 mmol) synthesized in the same manner as Example 17 was added to a THF suspension (15 mL) containing sodium borohydride (271.9 mg, 7.38 mmol) at room temperature for 0.5 hours. After completion of the dropwise addition, aluminum chloride (984.0 mg, 7.38 mmol) was added for 1 hour. After water was added to the reaction mixture, concentrated hydrochloric acid was added thereto to adjust pH of the mixture to be 1.5. The resulting reaction mixture was further stirred at 50° C. for 1 hour, and the organic layer was separated. It was confirmed by comparative analysis of the organic layer with sample product using HPLC that the organic layer contained 1.18 g of the title compound (yield: 84%). It was also found that anti-form:syn-form was 98:2 and the optical purity of the anti-form was 97% ee.

Workup

additionwas added for 1 hour
additionwas added
customThe resulting reaction mixture
customthe organic layer was separated

Sources & evidence

ORD record: ord-20623c3c66cf484a95c339287bc09b86
Source dataset: uspto-grants-2012_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08207370B2

Reaction notes

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