Methyl chloroformate → HCID 78035674, compound

Step b) To a solution of ((1RS,2SR)-2-amino-2-(3-nitrophenyl)cyclopropyl)methanol (2.85 g, 13.7 mmol, Eq: 1.00) in dichloromethane (27.4 ml) was added at 5° C. diisopropylethylamine (2.65 g, 3.59 ml, 20.5 mmol, Eq: 1.5) and methyl chloroformate (1.42 g, 1.17 ml, 15.1 mmol, Eq: 1.1) dropwise via syringe. The reaction mixture was stirred at rt for 16 hours. The reaction mixture was extracted with sat NaHCO3 solution and dichloromethane. The organic layer was washed with water and brine, the aqueous layers were reextracted with dichloromethane. The combined organic layers were dried over Na2SO4, filtered and evaporated to give a brown oil which was purified by silica gel flash chromatography with 0-100% EtOAc in heptane to give the title methyl (1SR,2RS)-2-(hydroxymethyl)-1-(3-nitrophenyl)cyclopropylcarbamate (3.52 g, 13.2 mmol, 96.6% yield) as a light brown oil.

1. extractionThe reaction mixture was extracted with sat NaHCO3 solution and dichloromethane
2. washThe organic layer was washed with water and brine
3. dry with materialThe combined organic layers were dried over Na2SO4
4. filtrationfiltered
5. customevaporated
6. customto give a brown oil which
7. customwas purified by silica gel flash chromatography with 0-100% EtOAc in heptane

ORD record

ord-d8d2ecdedb294595ac64f9b74e26225b

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08927535B2