Thiazole-4-carboxaldehyde → Azd-7268

HRID 1011283Notes

Reaction equation

HRID 1011283 reaction equation
[OH:1][CH2:2][CH2:3][N:4]([CH3:30])[C:5](=[O:29])[C:6]1[CH:11]=[CH:10][C:9]([C:12](=[C:23]2[CH2:28][CH2:27][NH:26][CH2:25][CH2:24]2)[C:13]2[CH:14]=[CH:15][CH:16]=[C:17]3[C:22]=2[N:21]=[CH:20][CH:19]=[CH:18]3)=[CH:8][CH:7]=1.[S:31]1[CH:35]=[C:34]([CH:36]=O)[N:33]=[CH:32]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClC(Cl)C.C(Cl)Cl>[OH:1][CH2:2][CH2:3][N:4]([CH3:30])[C:5](=[O:29])[C:6]1[CH:7]=[CH:8][C:9]([C:12]([C:13]2[CH:14]=[CH:15][CH:16]=[C:17]3[C:22]=2[N:21]=[CH:20][CH:19]=[CH:18]3)=[C:23]2[CH2:28][CH2:27][N:26]([CH2:36][C:34]3[N:33]=[CH:32][S:31][CH:35]=3)[CH2:25][CH2:24]2)=[CH:10][CH:11]=1

Participants

6

Reactant 3

HCID 2763214Thiazole-4-carboxaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 248976691018987-99-9

Product 1

HCID 24772484Azd-7268Yield 49%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 63651,1-DichloroethaneSolvent

Procedure

Compound 1C (3.3 g, 8.3 mmol) and 4-thiazolecarboxaldehyde (1.4 g, 12.4 mmol) in dichloroethane (16 mL) were stirred for 30 min. under nitrogen. Sodium triacetoxyborohydride (5.3 g, 24 9 mmol) was added and the reaction was stirred for 20 h. The mixture was diluted with CH2Cl2 (20 mL) and washed with saturated aqueous NaHCO3. The organic phase was dried over Na2SO4 and concentrated. Column chromatography (120 g silica gel, eluting with 4% 7N NH3/MeOH in CH2Cl2) gave 2.01 g 1D as a white solid (49%). 1H NMR (500.333 MHz, CDCl3) δ 8.90 (dd, J=4.1, 1.7 Hz, 1H), 8.76 (d, J=1.9 Hz, 1H), 8.11 (dd, J=8.0, 1.5 Hz, 1H), 7.72 (dd, J=7.3, 2.3 Hz, 1H), 7.51-7.46 (m, 2H), 7.37-7.33 (m, 3H), 7.31-7.29 (m, 2H), 7.18 (s, 1H), 3.85 (s, br, 2H), 3.76 (s, 2H), 3.67 (br s, 2H), 3.26 (br s, 1H), 3.02 (s, 3H), 2.78-2.71 (m, 1H), 2.67-2.52 (m, 4H), 2.46-2.37 (m, 1H), 2.14-2.04 (m, 2H). TOF MS E+ 499.21.

Workup

  1. washwashed with saturated aqueous NaHCO3
  2. dry with materialThe organic phase was dried over Na2SO4
  3. concentrationconcentrated
  4. washColumn chromatography (120 g silica gel, eluting with 4% 7N NH3/MeOH in CH2Cl2)

Sources & evidence

ORD record
ord-5683d2c3d7ae4e9a8ced9c9c5a44709c
Source dataset
uspto-grants-2011_07
Patent number
US07977355B2

Reaction notes

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