Benzyl chloroformate → HCID 21967721, compound

Participants

Reaction Steps

(2S,4S)-N-Benzyloxycarbonyl-4-isobutyl-2-(4'-methoxyphenyl)-1,3-oxazolidin-5-one (15) was prepared from sodium N-(para-methoxybenzylidene)-(L)-leucinate (2.71 g, 10.0 mM) and benzyl chloroformate (1.43 mL, 10.0 mM) following general procedure C and obtained as a colourless oil after purification by flash column chromatography, using 25% ethyl acetate/petrol as eluant (3.21 g, 84%, single diastereomer): [α]D20 -30.0 (c 1.0, CHCl3); IR (CHCl3): 1795, 1715 cm-1 ; 1H NMR (200 MHz, CDCl3): δ 6.89-7.38 (m, 9H), 6.71 (s, 1H), 5.20 (s, 2H), 4.47 (t, J=7 Hz, 1H), 3.82 (s, 3H), 1.57-1.98 (m, 3H), 0.88-0.92 (m, 6H); 13C NMR (50.3 MHz, CDCl3): δ 172.5, 160.4, 154.0, 135.3, 129.2, 128.6, 128.3, 127.4, 113.9, 88.8, 68.1, 55.3, 54.4, 42.1, 24.5, 22.3, 22.2; LRMS (NH3): 384 (MH+); HRMS: calcd for C22H26NO5 (MH+): 384.1811; found: 384.1811.

Provenance & Evidence