反应详情

温度

-78 °C

Copper(I)cyanide (120 mg, 1.34 mmol) was added to a solution of (R)-(-)-2-(benzyloxymethyl)oxirane (2.4 g, 14.6 mmol) in dry THF (200 ml). This mixture was cooled to -78° C. under argon atmosphere. A solution of vinylmagnesium bromide in THF (26 ml, 1M, 26 mmol) was added slowly to the epoxide solution at -78° C. The reaction mixture was stirred for 5 hours while the reaction temperature was allowed to warm to 0° C. Saturated aqueous NH4Cl and NH4OH were added to the reaction mixture till the reaction mixture became clear. Organic layer was separated and the aqueous layer was extracted with EtOAc (3×50 ml). Combined organic layers were dried over MgSO4 and concentrated. The residue was purified by chromatography (EtOAc/Hexane=1:9) to give 1-benzyloxy-2(S)-hydroxy-4-pentent (2.6 g, 13.5 mmol) NMR (CDCl3): 7.35 (bs, 5H), 5.84 (m, 1H), 5.14 (d, J=11, 1H), 5.11 (d, J=9, 1H), 4.57 (s, 2H), 3.90 (m, 1H), 3.53 (dd, J=3.4, 9.5, 1H), 3.39 (dd, J=7.4, 9.5, 1H) 2.29 (t, J=1.23, 2H).

1. temperatureto warm to 0° C
2. customOrganic layer was separated
3. extractionthe aqueous layer was extracted with EtOAc (3×50 ml)
4. dry with materialCombined organic layers were dried over MgSO4
5. concentrationconcentrated
6. customThe residue was purified by chromatography (EtOAc/Hexane=1:9)
7. customto give 1-benzyloxy-2(S)-hydroxy-4-pentent (2.6 g, 13.5 mmol) NMR (CDCl3): 7.35 (bs, 5H), 5.84 (m, 1H), 5.14 (d, J=11, 1H), 5.11 (d, J=9, 1H), 4.57 (s, 2H), 3.90 (m, 1H), 3.53 (dd, J=3.4, 9.5, 1H), 3.39 (dd, J=7.4, 9.5, 1H) 2.29 (t, J=1.23, 2H)