Dimethyl Sulfoxide → methyl 4-[(2R)-2-formyl-3,4-dihydro-2H-chromen-6-yl]benzoate

HRID 432087Notes

Reaction equation

HRID 432087 reaction equation
CS(C)=O.C(Cl)(=O)C(Cl)=O.[OH:11][CH2:12][C@H:13]1[CH2:22][CH2:21][C:20]2[C:15](=[CH:16][CH:17]=[C:18]([C:23]3[CH:32]=[CH:31][C:26]([C:27]([O:29][CH3:30])=[O:28])=[CH:25][CH:24]=3)[CH:19]=2)[O:14]1.C(N(CC)CC)C>C(Cl)Cl>[CH:12]([C@H:13]1[CH2:22][CH2:21][C:20]2[C:15](=[CH:16][CH:17]=[C:18]([C:23]3[CH:32]=[CH:31][C:26]([C:27]([O:29][CH3:30])=[O:28])=[CH:25][CH:24]=3)[CH:19]=2)[O:14]1)=[O:11]

Participants

6

Reactant 4

HCID 679Dimethyl SulfoxideHCID 8471TriethylamineHCID 65578Oxalyl chlorideHCID 9900874methyl 4-[(2R)-2-(hydroxymethyl)-3,4-dihydro-2H-chromen-6-yl]benzoate

Product 1

HCID 9965972methyl 4-[(2R)-2-formyl-3,4-dihydro-2H-chromen-6-yl]benzoate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of 33 mg (0.425 mmol) dimethyl sulfoxide in 2 mL of methylene chloride at −78° C., was added 0.14 mL (0.272 mmol) 2M oxalyl chloride. After the solution had stirred at this temperature for 10 minutes, a solution of 50 mg (0.17 mmol) methyl 4-[(2R)-2-(hydroxymethyl)-3,4-dihydro-2H-chromen-6-yl]benzoate (Example 16) in 2 mL of methylene chloride was added dropwise and the resulting mixture was stirred at −78° C. for an additional 1.6 hours. At this time, 0.14 mL (1.02 mmol) triethylamine was added to the mixture slowly, and then it was allowed to warm to room temperature over 15 minutes. The solution of desired product was used without further purification.

Workup

  1. stirringthe resulting mixture was stirred at −78° C. for an additional 1.6 hours
  2. customThe solution of desired product was used without further purification

Sources & evidence

ORD record
ord-80abb393b6074629abcf1e074e08f662
Source dataset
uspto-grants-2003_12
Patent number
US06660752B2

Reaction notes

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