Cesium carbonate → (S)-tert-butyl 2-(4-(3-chloropyridin-2-ylamino)phenyl)morpholine-4-carboxylate

HRID 710268Notes

Reaction equation

[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]2[O:13][CH2:12][CH2:11][N:10]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:9]2)=[CH:4][CH:3]=1.Cl[C:22]1[C:27]([Cl:28])=[CH:26][CH:25]=[CH:24][N:23]=1.C(=O)([O-])[O-].[Cs+].[Cs+].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>O1CCOCC1>[Cl:28][C:27]1[C:22]([NH:1][C:2]2[CH:7]=[CH:6][C:5]([C@@H:8]3[O:13][CH2:12][CH2:11][N:10]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:9]3)=[CH:4][CH:3]=2)=[N:23][CH:24]=[CH:25][CH:26]=1

Participants

Conditions

Temperature: 100 °C

Procedure

(S)-tert-Butyl 2-(4-aminophenyl)morpholine-4-carboxylate (120 mg, 0.43 mol), 2,3-dichloropyridine (64 mg, 0.43 mmol) and cesium carbonate (211 mg, 0.647 mmol) were combined with dioxane (2 ml) to give a suspension. The mixture was degassed with argon for 5 min. Xanthphos (15 mg, 0.026 mmol) and tris(dibenzylideneacetone)dipalladium chloroform complex (13 mg, 0.013 mmol) were added. The reaction mixture was capped and stirred at 100° C. for 2 h. The crude reaction mixture was filtered through a syringe filter, concentrated in vacuo and purified by flash chromatography (20 g silica gel, 5 to 20% ethyl acetate in heptane) yielded a light yellow foam (88 mg, 53%); MS (ISP): 390.2 ([{35Cl}M+H]+), 392.2 ([{37Cl}M+H]+).

Workup

customto give a suspension
customThe mixture was degassed with argon for 5 min
customThe reaction mixture was capped
customThe crude reaction mixture
filtrationwas filtered through a syringe
filtrationfilter
concentrationconcentrated in vacuo
custompurified by flash chromatography (20 g silica gel, 5 to 20% ethyl acetate in heptane)

Sources & evidence

ORD record: ord-f0bb471387ca47bf98d288d089143eaa
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09181230B2

Reaction notes

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