tert-Butyl hydroperoxide → (2R-trans)-3-[3-(1-Dodecynyl)pbenyl]oxiranemethanol

Participants

Reaction Conditions

Reaction Steps

To a solution (-) diisopropyltartrate (524 mg) in dry dichloromethane (60 ml) and 4A molecular sieves (1 g) at -20° C. was added titanium(IV) isopropoxide (0.53 ml) followed by t-butylhydroperoxide (3.0M, isooctane) (20 ml). The reaction mixture was stirred for 20 mins at-20° C. and then a solution of trans-3-[3-(1-dodecynyl)phenyl]propene-1-ol (8.88 g) in dichloromethane (20 ml) was added slowly. The mixture was stirred for 1.5 hr and quenched with 25% aqueous sodium hydroxide (6 ml) followed by water (40 ml). The mixture was allowed to warm to room temperature, and was stirred for 30 min. The organic phase was separated, and the aqueous phase was extracted with dichloromethane. The organic extracts were combined, dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated in vacuo. The residue was chromatographed over silica gel (eluted with ethyl acetate/Heptane/1:2). The appropriate fractions were collected and evaporated. The residue was crystallized from heptane to afford 6.5 g (69%) of product, mp 41°-42° C. [α]D25 +33.1° (c. 0.725, chloroform).

Provenance & Evidence