Methanol → 4-[2-(4-chloromethyl-benzoylamino)-4-methoxy-benzothiazol-7-yl]-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

HRID 1582129Notes

Reaction equation

HRID 1582129 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH:12]=[C:11]([C:14]2[C:22]3[S:21][C:20]([NH2:23])=[N:19][C:18]=3[C:17]([O:24][CH3:25])=[CH:16][CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[Cl:33][CH2:34][C:35]1[CH:43]=[CH:42][C:38]([C:39](Cl)=[O:40])=[CH:37][CH:36]=1.CO>O1CCOCC1.CN(C1C=CN=CC=1)C>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH:10]=[C:11]([C:14]2[C:22]3[S:21][C:20]([NH:23][C:39](=[O:40])[C:38]4[CH:42]=[CH:43][C:35]([CH2:34][Cl:33])=[CH:36][CH:37]=4)=[N:19][C:18]=3[C:17]([O:24][CH3:25])=[CH:16][CH:15]=2)[CH2:12][CH2:13]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

7

Reactant 4

HCID 887MethanolHCID 8471TriethylamineHCID 701364-(Chloromethyl)benzoyl chlorideHCID 207255094-(2-amino-4-methoxy-benzothiazol-7-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

Product 1

HCID 207255084-[2-(4-chloromethyl-benzoylamino)-4-methoxy-benzothiazol-7-yl]-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl esterYield 74%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 312751,4-DioxaneSolvent2×

Procedure

To a solution of 0.35 g (0.97 mMol) 4-(2-amino-4-methoxy-benzothiazol-7-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester in 20 ml dioxane were added 0.2 ml triethyl amine, 12 mg DMAP and 0.238 g (1.26 mMol) 4-chloromethyl-benzoyl chloride, dissolved in 1 ml of dioxane. The reaction mixture was heated to reflux for 3 h. Then 5 ml methanol were added. The solvent was evaporated to dryness, the residue taken up in ethyl acetate and washed with water and brine. The organic phase was dried over sodium sulfate and evaporated to dryness in vacuo. The residue was subjected to column chromatography (ethyl acetate/hexane 1:1) to yield 0.37, (74%) 4-[2-(4-chloromethyl-benzoylamino)-4-methoxy-benzothiazol-7-yl]-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester as a white foam. ES-MS m/e (%): 514 ([M+H]+, 100).

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureto reflux for 3 h
  3. customThe solvent was evaporated to dryness
  4. washwashed with water and brine
  5. dry with materialThe organic phase was dried over sodium sulfate
  6. customevaporated to dryness in vacuo

Sources & evidence

ORD record
ord-0c3dff48228242ef83ec5e9db136693d
Source dataset
uspto-grants-2004_05
Patent number
US06734179B2

Reaction notes

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