Trichloroacetyl chloride → tert-Butyl 5,5-dichloro-6-oxo-2-azaspiro[3.3]heptane-2-carboxylate

HRID 1943595Notes

Reaction equation

[CH2:1]=[C:2]1[CH2:5][N:4]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])[CH2:3]1.[Cl:13][C:14]([Cl:19])(Cl)[C:15](Cl)=[O:16].COCCOC>C(OCC)C.[Zn]>[Cl:13][C:14]1([Cl:19])[C:15](=[O:16])[CH2:1][C:2]21[CH2:3][N:4]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])[CH2:5]2

Participants

Conditions

Temperature: 10 °C

Procedure

Under an inert atmosphere, 7.728 g (118.19 mmoles) of zinc in nanopowder form are suspended in 100 ml of diethyl ether. 5.00 g (29.55 mmoles) of tert-butyl 3-methylene-azetidine-1-carboxylate (WO 2008124085) are added, then the medium is cooled to 10° C. A solution of 6.60 ml (59.09 mmoles) of trichloroacetyl chloride in ml of 1,2-dimethoxyethane is added drop by drop while maintaining the temperature of the reaction medium between 26 and 30° C. After stirring for 14 hrs at ambient temperature, the medium is filtered over celite, the celite is copiously rinsed with diethyl ether and the filtrate is partially concentrated under reduced pressure. The crude reaction product thus obtained is used as such in the following stage.

Workup

temperaturewhile maintaining the temperature of the reaction medium between 26 and 30° C
filtrationthe medium is filtered over celite
washthe celite is copiously rinsed with diethyl ether
concentrationthe filtrate is partially concentrated under reduced pressure
customThe crude reaction product
customthus obtained

Sources & evidence

ORD record: ord-ade1e48e085e4c8d910f142994fe43b5
Source dataset: uspto-grants-2013_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08394787B2

Reaction notes

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