Potassium Hydroxide → Tert-butyl 3-(3-bromophenyl)-3-(2-ethoxy-2-oxoethyl)azetidine-1-carboxylate

To a solution of [RhCl(COD)]2 (63 mg, 0.031 mmol) in dioxane (10 mL) was added aqueous KOH (1.5M, 8.29 mmol, 5.53 mL), followed by (3-bromophenyl)boronic acid (1.67 g, 8.29 mmol). Then a solution of the tert-butyl 3-(2-ethoxy-2-oxoethylidene)azetidine-1-carboxylate in dioxane (7.5 mL) was added. The reaction mixture was microwaved at 100° C. for 5 min at 300 W. Brine was added and the mixture was extracted twice with ethyl acetate. The combined organics were washed with brine and then dried (MgSO4), filtered and concentrated. Purification by column chromatography (4/1 Pet ether/ethyl acetate) gave the Michael adduct (1.31 g, 79%) as a light yellow oil.

1. customThe reaction mixture was microwaved at 100° C. for 5 min at 300 W
2. extractionthe mixture was extracted twice with ethyl acetate
3. washThe combined organics were washed with brine
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification by column chromatography (4/1 Pet ether/ethyl acetate)

ORD record

ord-80227f3fc3b34360ac6f972c2062adf3

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08173635B2