Potassium Carbonate → (S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(5'-methoxy-2,3'-bipyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

HRID 510269Notes

Reaction equation

HRID 510269 reaction equation
[C:1]([O:7][CH2:8][C@@H:9]([O:34][C:35]([CH3:38])([CH3:37])[CH3:36])[C:10]1[C:25]([CH3:26])=[CH:24][C:13]2[N:14]=[C:15]([C:17]3[CH:22]=[CH:21][N:20]=[C:19](Cl)[CH:18]=3)[S:16][C:12]=2[C:11]=1[C:27]1[CH:32]=[CH:31][C:30]([Cl:33])=[CH:29][CH:28]=1)(=[O:6])[C:2]([CH3:5])([CH3:4])[CH3:3].[CH3:39][O:40][C:41]1[CH:42]=[C:43](B2OC(C)(C)C(C)(C)O2)[CH:44]=[N:45][CH:46]=1.C(=O)([O-])[O-].[K+].[K+]>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:1]([O:7][CH2:8][C@@H:9]([O:34][C:35]([CH3:36])([CH3:37])[CH3:38])[C:10]1[C:25]([CH3:26])=[CH:24][C:13]2[N:14]=[C:15]([C:17]3[CH:22]=[CH:21][N:20]=[C:19]([C:43]4[CH:44]=[N:45][CH:46]=[C:41]([O:40][CH3:39])[CH:42]=4)[CH:18]=3)[S:16][C:12]=2[C:11]=1[C:27]1[CH:28]=[CH:29][C:30]([Cl:33])=[CH:31][CH:32]=1)(=[O:6])[C:2]([CH3:4])([CH3:3])[CH3:5]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 38661613-Methoxy-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridineHCID 86699798(S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(2-chloropyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

Product 1

HCID 86699800(S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(5'-methoxy-2,3'-bipyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

Reagents, catalysts & solvents 1

HCID 178418397HCID 178418397, compoundCatalyst

Conditions

Temperature
110 °C

Procedure

(S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(2-chloropyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate (40.0 mg, 0.070 mmol), 5-methoxy-3-pyridineboronic acid pinacol ester (19.7 mg, 0.084 mmol), potassium carbonate (29.0 mg, 0.210 mmol), and Pd(PPh3)4 (12.1 mg, 0.010 mmol) were placed in a microwave vial and the vial was vacuum pumped and flushed with argon three times. To this mixture was added degassed 1,4-dioxane (0.8 mL) and water (0.2 mL). The reaction mixture was heated at 110° C. for 1 h then cooled to rt. The aqueous layer was separated and extracted three times with ethyl acetate. All organic layers were combined, dried over Na2SO4, and concentrated. Purification by flash column chromatography on silica gel (hexanes/ethyl acetate eluent) provided the product. LCMS-ESI+: calc'd for C36H39ClN3O4S: 644.2 (M+H+); Found: 644.1 (M+H+); 1H NMR (400 MHz, CDCl3) δ 8.89 (s, 1H), 8.81 (d, J=4.9 Hz, 1H), 8.40 (d, J=2.7 Hz, 1H), 8.35 (s, 1H), 8.02 (s, 1H), 7.95 (s, 1H), 7.83 (d, J=5.2 Hz, 1H), 7.57 (d, J=8.4 Hz, 1H), 7.51 (d, J=8.5 Hz, 1H), 7.43 (d, J=8.4 Hz, 1H), 7.31 (d, J=8.7 Hz, 1H), 4.83 (dd, J=9.4, 2.7 Hz, 1H), 4.43 (dd, J=11.2, 9.5 Hz, 1H), 4.30 (dd, J=12.1, 2.9 Hz, 1H), 3.99 (s, 3H), 2.81 (s, 3H), 1.15 (s, 9H), 0.97 (s, 9H).

Workup

  1. customflushed with argon three times
  2. additionTo this mixture was added
  3. customdegassed 1,4-dioxane (0.8 mL) and water (0.2 mL)
  4. temperaturethen cooled to rt
  5. customThe aqueous layer was separated
  6. extractionextracted three times with ethyl acetate
  7. dry with materialdried over Na2SO4
  8. concentrationconcentrated
  9. customPurification by flash column chromatography on silica gel (hexanes/ethyl acetate eluent)
  10. customprovided the product

Sources & evidence

ORD record
ord-dd093311ae6942878341515693ada91b
Source dataset
uspto-grants-2015_08
Patent number
US09096586B2

Reaction notes

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