Thionyl Chloride → 2-Bromoimidazo[2,1-b]thiazole-6-carbonyl azide

HRID 716509Notes

Reaction equation

S(Cl)(Cl)=O.[Br:5][C:6]1[S:10][C:9]2=[N:11][C:12]([C:14]([OH:16])=O)=[CH:13][N:8]2[CH:7]=1.[N-:17]=[N+:18]=[N-:19].[Na+]>O>[Br:5][C:6]1[S:10][C:9]2=[N:11][C:12]([C:14]([N:17]=[N+:18]=[N-:19])=[O:16])=[CH:13][N:8]2[CH:7]=1

Participants

Conditions

Temperature: 85 °C

Procedure

Thionyl chloride (0.33 mol) was added to 2-bromoimidazo[2,1-b]thiazole-6-carboxylic acid (13.1 mmol). The reaction mixture was stirred at 85° C. during 3 hrs. The mixture was then concentrated under vacuum and the residue was taken in acetone (40 mL). The sodium azide (14.4 mmol) in water (5.2 mL) was added in one portion at 0° C. and the mixture was stirred at 0-10° C. for 45 min. Water was added, and the solid filtered off and washed with water and then with a mixture of water/acetone (50/50). The solid was dried in vacuo to give compound 9 as a beige solid in 80% yield. 1H NMR (DMSO-d6, 400 MHz) δ (ppm) 8.27 (s, 1H), 8.49 (s, 1H); and MS (ESI, EI+) m/z=272.05-274.07 (MH+).

Workup

concentrationThe mixture was then concentrated under vacuum
stirringthe mixture was stirred at 0-10° C. for 45 min
filtrationthe solid filtered off
washwashed with water
additionwith a mixture of water/acetone (50/50)
customThe solid was dried in vacuo

Sources & evidence

ORD record: ord-8b634c5bef6842e691d610e4791aa1ed
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09187496B2

Reaction notes

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