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]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.
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