Ethyl 6-chloronicotinate → Ethyl 6-[(2,2,4,4-tetramethyl-thiochroman-6-yl)ethynyl]nicotinate

HRID 52377Notes

Reaction equation

HRID 52377 reaction equation
[CH3:1][C:2]1([CH3:16])[CH2:11][C:10]([CH3:13])([CH3:12])[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:14]#[CH:15])[CH:8]=2)[S:3]1.Cl[C:18]1[CH:28]=[CH:27][C:21]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:20][N:19]=1>C(N(CC)CC)C.[Pd](Cl)Cl.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH3:1][C:2]1([CH3:16])[CH2:11][C:10]([CH3:12])([CH3:13])[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:14]#[C:15][C:18]3[CH:28]=[CH:27][C:21]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:20][N:19]=3)[CH:8]=2)[S:3]1

Participants

5

Reactant 2

HCID 2799611Ethyl 6-chloronicotinate2×HCID 156611292,2,4,4-Tetramethyl-6-ethynylthiochroman2×

Product 1

HCID 15661155Ethyl 6-[(2,2,4,4-tetramethyl-thiochroman-6-yl)ethynyl]nicotinate

Reagents, catalysts & solvents 2

HCID 6102075Dichlorobis(triphenylphosphine)palladiumCatalystHCID 8471TriethylamineSolvent

Conditions

Temperature
55 °C

Procedure

A solution of 232 mg (1.01 mmol) of 2,2,4,4-tetramethyl-6-ethynylthiochroman (Compound 35) and 190 mg (1.03 mmol) of ethyl 6-chloro-nicotinate (Compound 29) in 2 ml of triethylamine was placed in a heavy-walled glass tube, degassed, placed under argon and then treated with a powdered mixture of 53 mg (0.28 mmol) of cuprous iodide and 84 mg (0.12 mmol) of bis(triphenylphosphine) palladium (II) chloride. The mixture was degassed again, placed under argon and the tube was sealed. The reaction mixture was heated at 55 degrees C. for 60 h and then cooled to room temperature. The mixture was treated with water and ether and the organic layer was separated. The aqueous layer was extracted with ether, the organic layers were then combined and washed with saturated NaCl solution and then dried (MgSO4). The solvent was removed in vacuo and the resultant residue was purified by flash chromatograhy (silica; 10% ethyl acetate in hexanes) to give the title compound as a dark yellow oil. PMR (CDCl3): & 1.32-1.43 (15H, m), 1.92 (2H, s), 4.38 (2H, q, J-7.1 Hz), 7.28 (1H, dd, J-8.3 Hz, 1.8 Hz), 7.32-7.38 (2H, m), 7.53 (1H, d, J-8.3 Hz), 8.24 (1H, dd, J-8.2 Hz, 2.2 Hz), 9.16 (1H, d, J-2.2 Hz). MS exact mass, m/e 379.1594 (calcd. for C23H25NO2S, 379.1606).

Workup

  1. customdegassed
  2. customThe mixture was degassed again
  3. customthe tube was sealed
  4. temperaturecooled to room temperature
  5. additionThe mixture was treated with water and ether
  6. customthe organic layer was separated
  7. extractionThe aqueous layer was extracted with ether
  8. washwashed with saturated NaCl solution
  9. dry with materialdried (MgSO4)
  10. customThe solvent was removed in vacuo
  11. customthe resultant residue was purified by flash chromatograhy (silica; 10% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-b844ba5b7aab4b3899de1829058d68ac
Source dataset
uspto-grants-1997_04
Patent number
US05616597

Reaction notes

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