Methyl 3-hydroxypivalate → Methyl 2,2-dimethyl-3-oxopropanoate

Step-1: A solution of methyl 3-hydroxy-2,2-dimethylpropanoate (8.6 g, 65.1 mmol) in 100 mL DCM was cooled to 0° C. under N2. PCC (24.8 g, 115.2 mmol) was added portionwise over several minutes. The mixture was allowed to gradually warm to room temperature and was stirred overnight. The mixture was filtered through silica gel. Enough Celite is added to the remaining oil so that all is adsorbed. This is added to the top of a silica pad and this is washed with about 1.5 L DCM. The solution is then carefully concentrated in vacuo, maintaining the water bath at about 30° C. to obtain methyl 2,2-dimethyl-3-oxopropanoate as a clear colorless oil. 1H (300 MHz, CDCl3, δ) 9.60 (s, 1H), 3.70 (s, 3H), 1.29 (s, 6H).

1. filtrationThe mixture was filtered through silica gel
2. additionEnough Celite is added to the remaining oil so that
3. additionThis is added to the top of a silica pad
4. washthis is washed with about 1.5 L DCM
5. concentrationThe solution is then carefully concentrated in vacuo
6. temperaturemaintaining the water bath at about 30° C.

ORD-Eintrag

ord-39a6386595774a3aa4b6cda8cb9f1c92

Quelldatensatz

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08865752B2