Diisobutylaluminum hydride → (R)-3-(tert-butyldimethylsilyloxy)-4-chlorobutanal

온도

-78 °C

To a solution of (R)-methyl 3-(tert-butyldimethylsilyloxy)-4-chlorobutanoate (2.13 g, 104.7 mmol) in CH3Cl2 was added dropwise DIBAL-H (120 mL, 1 M in toluene, 120 mmol) at −78° C. under N2 atmosphere. The mixture was stirred at −78° C. for 4 h. CH3OH (80 mL) was added slowly to the reaction, mixture at −78° C. Then the temperature was warmed to room temperature gradually. The mixture was filtered and the cake was washed with CH2Cl2. The combined filtrates were concentrated under reduced pressure and purified by column chromatography (PE) to give (R)-3-(tert-butyldimethylsilyloxy)-4-chlorobutanal (13 g, 60% over 2 steps). 1H NMR (300 MHz, CDCl3) δ 9.80 (t, J=1.6 Hz, 1H), 4.35-4.42 (m, 1H), 3.53 (dd, J=11.1 Hz, 4.8 Hz, 1H), 3.46 (dd, J=12 Hz, 6.3 Hz, 1H), 2.63-2.82 (m, 2H), 0.87 (s, 9H), 0.12 (s, 3H), 0.08 (s, 3H).

1. temperatureThen the temperature was warmed to room temperature gradually
2. filtrationThe mixture was filtered
3. washthe cake was washed with CH2Cl2
4. concentrationThe combined filtrates were concentrated under reduced pressure
5. custompurified by column chromatography (PE)

ORD 기록

ord-860942903d624df8a4a268fcbe211962

출처 데이터셋

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US09351962B2