[OH:1][C:2]1[CH:3]=[C:4]([CH:7]=[C:8]([CH:10]([CH3:12])[CH3:11])[CH:9]=1)[CH:5]=[O:6].[N:13]1([C:19](Cl)=[O:20])[CH2:18][CH2:17][O:16][CH2:15][CH2:14]1.CCN(CC)CC.C([O-])(O)=O.[Na+]>C(Cl)Cl>[N:13]1([C:19]([O:1][C:2]2[CH:9]=[C:8]([CH:10]([CH3:12])[CH3:11])[CH:7]=[C:4]([CH:5]=[O:6])[CH:3]=2)=[O:20])[CH2:18][CH2:17][O:16][CH2:15][CH2:14]1To a stirring solution of 91.9 mg (0.634 mmol) of 3-hydroxy-5-isopropylbenzaldehyde in 5 mL of CH2Cl2 at r.t. was added 220 μL (1.92 mmol) of 4-morpholinecarbonyl chloride and 0.5 mL (3.59 mmol) of Et3N. After 3 h, sat. NaHCO3 (15 mL) was added, and the aqueous layer was extracted with CHCl3. The organic layer was washed with brine, dried over Na2SO4, filtered, and concentrated. Purification by flash silica gel chromatography (20% EtOAc/hexanes) provided 38.8 mg of 3-formyl-5-isopropylphenyl morpholine-4-carboxylate as a yellow oil in 24% yield.
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