3-Chloro-2-methyl-1-propene → HCID 57002668, compound

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Reaction Steps

To a cold (0° C.) suspension of NaH (2.68 g, 60%) in THF (150 mL) was added a solution of 1,1-diethoxyethanol [which was prepared according to the literature procedure of Zirkle, C. L. et. al. J. Org. Chem. 1961, 26, 395-407] (9.00 g) in THF (20 mL), and the reaction mixture was stirred at room temperature for 1 hour before adding methallyl chloride (8.0 mL). The reaction mixture was heated to reflux overnight, cooled and filtered through a plug of celite. Solvent was removed by rotary evaporation, and the residue purified by column chromatography (silica, 20% ether/hexane) to give 1,1-diethoxyethylmethallyl ether (11.5, 90%). Ozonolysis of a chilled (−30° C.) solution of this ether (6.00 g) in EtOAc (80 mL) was carried out until no starting material was detectable by TLC (1 hour). At this time, the reaction was purged with oxygen, treated with Pd(OH)2 (150 mg) and stirred under an atmosphere of hydrogen overnight. The catalyst was filtered away, and the filtrate was concentrated by rotary evaporation. The resulting residue was purified by column chromatography (silica, 20% EtOAc/hexane) to afford (1,1-diethoxy-ethoxy)acetone (4.53 g, 82%).

Provenance & Evidence