Water → HCID 86715650, compound

Temperature

0 °C

A 2.5 M solution of n-butyllithium in hexanes (9.60 mL, 24.0 mmol) was added dropwise to a stirring solution of 1-methyl-1H-1,2,3-triazole (2.00 g, 24.0 mmol, prepared according to PCT Int. Appl., 2008098104) in dry THF (100 mL) at −50° C. The reaction became heterogeneous and yellow during addition. After 15 min, a solution of tert-butyl 3-formylazetidine-1-carboxylate (4.45 g, 24.0 mmol) in dry THF (10 mL) was added dropwise by syringe. The reaction mixture became homogeneous and was allowed to slowly warm to 0° C. Water (10 mL) and ethyl acetate (100) mL were added. The biphasic mixture was warmed to 23° C. The mixture was partitioned between half-saturated aqueous sodium chloride solution (100 mL) and ethyl acetate (300 mL). The layers were separated. The organic layer was dried with sodium sulfate and the dried solution was filtered. Celite (14 g) was added to the filtrate and the solvents were removed by rotary evaporation to provide a free-flowing powder. The powder was loaded onto a silica gel column. Elution with ethyl acetate initially, grading to 5% methanol-ethyl acetate provided the title compound as a white foam.

1. additionThe reaction became heterogeneous and yellow during addition
2. temperatureThe biphasic mixture was warmed to 23° C
3. customThe mixture was partitioned between half-saturated aqueous sodium chloride solution (100 mL) and ethyl acetate (300 mL)
4. customThe layers were separated
5. dry with materialThe organic layer was dried with sodium sulfate
6. filtrationthe dried solution was filtered
7. additionCelite (14 g) was added to the filtrate
8. customthe solvents were removed by rotary evaporation
9. customto provide a free-flowing powder
10. washElution with ethyl acetate initially

ORD record

ord-2cb58c2be2c540668945b669943af4e3

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09290476B2