Sodium hydride → HCID 45092263, compound

Temperature

0 °C

A suspension of 60% NaH (350 mg, 8.8 mmol) in dry CH2Cl2 under N2 at 0° C. was added a solution of BocNHOH in CH2Cl2 (5 mL). The reaction mixture was stirred at 0° C. for 30 minutes, where after a solution of (R)-α-tosyloxy-γ-butyrolactone (2 g, 7.8 mmol) in CH2Cl2 (5 mL) was added. The reaction mixture was allowed to warm up to room temperature, and left with stirring overnight. The reaction mixture was quenched with 1M phosphate buffer pH=6.3 (20 mL) and the organic phase separated. The aqueous phase was extracted with CH2Cl2 (2×20 mL), and the combined organic fractions extracted with NaCl (aq., sat.) (15 mL). The organic fraction was dried with Na2SO4, filtered and evaporated to dryness. Column chromatography (150 g SiO2, eluent: EtOAc:PE60/80=1:2) gave 1.5 g (89%) of (S)-α-N-Boc-aminoxy-γ-butyrolactone. [α]D25=−42°; [α]36525=−127°.

1. temperatureto warm up to room temperature
2. waitleft
3. stirringwith stirring overnight
4. customThe reaction mixture was quenched with 1M phosphate buffer pH=6.3 (20 mL)
5. customthe organic phase separated
6. extractionThe aqueous phase was extracted with CH2Cl2 (2×20 mL)
7. extractionthe combined organic fractions extracted with NaCl (aq., sat.) (15 mL)
8. dry with materialThe organic fraction was dried with Na2SO4
9. filtrationfiltered
10. customevaporated to dryness

ORD record

ord-a64bc49fd7cf40af83538cdce1ef3ee5

Source dataset

uspto-grants-2009_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07632948B2