Water → Ethyl (1R,2R)-2-(hydroxymethyl)cyclopropanecarboxylate

関与物質

反応手順

To a solution of ethyl 2-formyl-1-cyclopropanecarboxylate (1.5 eq.) in methanol (0.7 M) at 0° C. was added sodium borohydride (1.5 eq.) in portions over 30 min. The mixture was allowed to stir at rt for 1.5 h and then cooled in an ice bath. Saturated aqueous NH4Cl solution was added dropwise, and the mixture was stirred for 1.5 h. Water was added, and the aqueous layer was extracted with EtOAc. The combined organic extracts were washed with brine, dried over MgSO4, and concentrated to afford a racemic mixture of the title compound as a clear oil. Racemic trans 2-(hydroxymethyl)cyclopropanecarboxylate was purified by a Chiral Pak AD preparative column (10% EtOH/Hex) to afford two enantiomers. Ethyl (1R,2R)-2-(hydroxymethyl)cyclopropanecarboxylate was eluted as the faster enantiomer (retention time=12.94 min).

情報源と証拠