HCID 54195713, compound → HCID 19018131, compound

Participants

Reaction Conditions

Reaction Steps

Experiment 8. 2-oxo-2-phenoxyethyl 3-phenyllactate (240 mL of a 10% w/v solution in tetrahydrofuran at 10 mL/hr) and nitrogen (240 mL/min) were passed through a 23-mm I.D. quartz tube containing 4 mL of coarsely crushed quartz on top of 4 mL of Catalyst A heated to 250° C. Contact time and WWH were 0.98 s and 0.77 hr-1, respectively. The column effluent was rotovaped, phenol was removed by distillation under reduced pressure to give crude product. Two crystallizations from anhydrous isopropanol gave 7.53 g (36.5 mmol) of 3-phenylmethyl-1,4-dioxane-2,5-dione. mp 64°-65° C. 1H NMR (300 MHz, CDCl3): δ3.28 (dd, 1H, J=5.7 and 14.6 Hz), δ3.37 (dd, 1H, J=4.6 and 14.7 Hz), δ3.89 (d, 1H, J=16.8 Hz), d 4.60 (d, 1H, J=16.8 Hz), δ5.17 (dd, 1H, J=4.6 and 5.7 Hz), and δ7.2-7.4 (phenyl, 5H). 13C NMR (75 MHz, CDCl3): 38.2, 65.0, 76.9, 128.1, 129.2, 130.1, 134.1, 163.4, and 165.1. HRMS calcd for C11H10O4 =206.0579, found 206.0574.

Provenance & Evidence