COP([CH2:7][C:8](=[O:22])[CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][NH:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])(=O)OC.C(=O)([O-])[O-].[K+].[K+].[CH3:29][C:30]1[N:35]=[CH:34][C:33]([CH:36]=O)=[CH:32][N:31]=1>C1COCC1.O>[C:18]([O:17][C:15](=[O:16])[NH:14][CH2:13][CH2:12][CH2:11][CH2:10][CH2:9][C:8](=[O:22])[CH:7]=[CH:36][C:33]1[CH:32]=[N:31][C:30]([CH3:29])=[N:35][CH:34]=1)([CH3:19])([CH3:20])[CH3:21]A solution of 24-2 (3.13 g, 9.28 mmol), potassium carbonate (1.75 g, 12.6 mmol), and 2-methyl-pyrimidine-5-carbaldehyde (1.04 g, 8.51 mmol) in THF (20 mL) was warmed to 40 ° C. for 5 h. The mixture was diluted with water and extracted four times with ether. The combined organics were washed with brine and dried (Na2SO4). Purification via silica chromatography (hexane/ethyl acetate) afforded the title compound 24-3 (1.67 g).
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