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Hydrochloric Acid → methyl 2-(8-(benzo[d]thiazol-2-ylcarbamoyl)-3,4-dihydroisoquinolin-2(1H)-yl)thiazole-4-carboxylate

HRID 1518266
Notes
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Reaction equation

HRID 1518266 reaction equation
Cl.Cl.[S:3]1[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=2[N:5]=[C:4]1[NH:12][C:13]([C:15]1[CH:16]=[CH:17][CH:18]=[C:19]2[C:24]=1[CH2:23][NH:22][CH2:21][CH2:20]2)=[O:14].Cl[C:26]1[S:27][CH:28]=[C:29]([C:31]([O:33][CH3:34])=[O:32])[N:30]=1.C([O-])([O-])=O.[Cs+].[Cs+].Cl>CC(N(C)C)=O>[S:3]1[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=2[N:5]=[C:4]1[NH:12][C:13]([C:15]1[CH:16]=[CH:17][CH:18]=[C:19]2[C:24]=1[CH2:23][N:22]([C:26]1[S:27][CH:28]=[C:29]([C:31]([O:33][CH3:34])=[O:32])[N:30]=1)[CH2:21][CH2:20]2)=[O:14]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 10796Cesium carbonateHCID 7213135Methyl 2-chloro-4-thiazolecarboxylateHCID 86644320N-(benzo[d]thiazol-2-yl)-1,2,3,4-tetrahydroisoquinoline-8-carboxamide dihydrochloride

Product 1

HCID 59447460methyl 2-(8-(benzo[d]thiazol-2-ylcarbamoyl)-3,4-dihydroisoquinolin-2(1H)-yl)thiazole-4-carboxylateYield 67.3%

Reagents, catalysts & solvents 1

HCID 31374DimethylacetamideSolvent

Conditions

Temperature
50 °C

Procedure

To a solution of N-(benzo[d]thiazol-2-yl)-1,2,3,4-tetrahydroisoquinoline-8-carboxamide dihydrochloride (1B) (5.3 g, 13.86 mmol) and methyl 2-chlorothiazole-4-carboxylate (2.5 g, 14 mmol) in DMA (60 mL) was added Cs2CO3 (25 g, 70 mmol). The reaction mixture was stirred at 50° C. overnight. The reaction mixture was cooled to rt, acidified with 5% HCl, extracted with DCM, washed with water, brine, dried over Na2SO4, and concentrated under reduced pressure. The crude material was purified by column chromatography on silica gel eluting with 5% MeOH in DCM to provide 4.2 g (67%) of the desired product methyl 2-(8-(benzo[d]thiazol-2-ylcarbamoyl)-3,4-dihydroisoquinolin-2(1H)-yl)thiazole-4-carboxylate (1C): LC/MS (APCI): m/z 451.0 (M+H).

Workup

  1. temperatureThe reaction mixture was cooled to rt
  2. extractionextracted with DCM
  3. washwashed with water, brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated under reduced pressure
  6. customThe crude material was purified by column chromatography on silica gel eluting with 5% MeOH in DCM

Sources & evidence

ORD record
ord-fdab4d4e8d3e4c69b52d9bbe6aa52d7b
Source dataset
uspto-grants-2012_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08232273B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes