Oxalyl chloride → N,N'-Dimethoxy-N,N'-dimethyloxamide

Temperatur

-78 °C

A mixture of 48.0 g (0.49 mol) of N,O-dimethylhydroxylamine HCl in 250 mL of 3:2 v/v CH2Cl2/pyridine was cooled to −78° C. and treated with 17.4 mL (0.2 mol) of oxalyl chloride maintaining the internal temperature at less than −70° C. The resulting mixture was allowed to warm to rt and stirred for 20 h. The reaction was quenched with 250 mL of sat'd NaCl and the quenched mixture was extracted with 3×400 mL of CH2Cl2. The extracts were combined, dried over MgSO4 and concentrated. Recrystallization from 250 mL of methyl t-butyl ether afforded 24.28 g (69%) of the title compound: 1H NMR (500 MHz) δ 3.25 (s, 6H), 3.75 (s, 6H).

1. temperatureto warm to rt
2. customThe reaction was quenched with 250 mL of sat'd NaCl
3. extractionthe quenched mixture was extracted with 3×400 mL of CH2Cl2
4. dry with materialdried over MgSO4
5. concentrationconcentrated
6. customRecrystallization from 250 mL of methyl t-butyl ether

ORD-Eintrag

ord-f466d204ef794186b88c2e89609aaeed

Quelldatensatz

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06265434B1