Potassium Carbonate → (S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(2-chloropyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

HRID 879282Notes

Reaction equation

HRID 879282 reaction equation
[C:1]([O:7][CH2:8][C@H:9]([C:15]1[C:24]([CH3:25])=[CH:23][C:18]2[N:19]=[C:20](Br)[S:21][C:17]=2[C:16]=1[C:26]1[CH:31]=[CH:30][C:29]([Cl:32])=[CH:28][CH:27]=1)[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])(=[O:6])[C:2]([CH3:5])([CH3:4])[CH3:3].[Cl:33][C:34]1[CH:39]=[C:38](B(O)O)[CH:37]=[CH:36][N:35]=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:10][C:11]([CH3:14])([CH3:13])[CH3:12])[C:15]1[C:24]([CH3:25])=[CH:23][C:18]2[N:19]=[C:20]([C:38]3[CH:37]=[CH:36][N:35]=[C:34]([Cl:33])[CH:39]=3)[S:21][C:17]=2[C:16]=1[C:26]1[CH:31]=[CH:30][C:29]([Cl:32])=[CH:28][CH:27]=1)(=[O:6])[C:2]([CH3:5])([CH3:4])[CH3:3]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 51515952-Chloropyridine-4-boronic acidHCID 86699799(S)-2-(2-bromo-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate

Product 1

HCID 86699798(S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(2-chloropyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

Reagents, catalysts & solvents 1

HCID 178418397HCID 178418397, compoundCatalyst

Conditions

Temperature
90 °C

Procedure

(S)-2-(2-bromo-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate (400.0 mg, 0.742 mmol), 2-chloro-4-pyridinylboronic acid (140.2 mg, 0.891 mmol), potassium carbonate (307.7 mg, 2.227 mmol), and Pd(PPh3)4 (128.7 mg, 0.111 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 (3.5 mL) and water (0.7 mL). The reaction mixture was heated at 90° C. for 4.5 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 final compound. LCMS-ESI+: calc'd for C30H33Cl2N2O3S: 571.2 (M+H+); Found: 571.1 (M+H+); 1H NMR (400 MHz, CDCl3) δ 8.49 (d, J=4.9 Hz, 1H), 7.93 (s, 2H), 7.77 (d, J=5.0 Hz, 1H), 7.55 (d, J=9.2 Hz, 1H), 7.50 (d, J=7.4 Hz, 1H), 7.40 (d, J=7.4 Hz, 1H), 7.29 (d, J=8.9 Hz, 1H), 4.82 (dd, J=8.9, 2.7 Hz, 1H), 4.42 (dd, J=11.2, 9.3 Hz, 1H), 4.29 (dd, J=11.5, 3.2 Hz, 1H), 2.80 (s, 3H), 1.14 (s, 9H), 0.97 (s, 9H).

Workup

  1. customflushed with argon three times
  2. additionTo this mixture was added
  3. customdegassed 1,4-dioxane (3.5 mL) and water (0.7 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)

Sources & evidence

ORD record
ord-1076f232a32942f3bdcc0e2ff27286ce
Source dataset
uspto-grants-2015_03
Patent number
US08987250B2

Reaction notes

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