Dimethyl Sulfoxide → Tert-butyl (2S,5S)-5-(((tert-butyldimethylsilyl)oxy)methyl)-2-formylmorpholine-4-carboxylate

温度

-78 °C

To a stirred solution of oxalyl chloride (2 eq) in DCM (0.3 M) at −78° C. was added a solution of DMSO (5 eq) in DCM (0.5M). The reaction mixture was stirred at −78° C. for 30 min. A solution of tert-butyl (2S,5S)-5-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-(hydroxymethyl)morpholine-4-carboxylate (1 eq) in CH2Cl2 (0.2M) was added dropwise and stirred at −40° C. for 1.5 hours. It was then cooled to −78° C. and triethylamine (7 eq) was added and the reaction mixture was stirred at 0° C. for 1 h. Water was added and the reaction mixture was warmed to rt for 30 min. The mixture was diluted with CH2Cl2, the organic layer was washed with water and brine, dried over Na2SO4, filtered and concentrated. The crude product was used as such for the next step.

1. stirringstirred at −40° C. for 1.5 hours
2. temperatureIt was then cooled to −78° C.
3. stirringthe reaction mixture was stirred at 0° C. for 1 h
4. temperaturethe reaction mixture was warmed to rt for 30 min
5. washthe organic layer was washed with water and brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated

ORDレコード

ord-4eb63425462545c59f4669ca39e92ca9

出典データセット

uspto-grants-2016_04

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09315475B2