Dichloromethane → Ethyl 4-methyl-5-(spiro[4.5]dec-7-en-8-yl)isoxazole-3-carboxylate

Participants

Reaction Steps

To a 2-5 mL microwave vial containing a solution of 4,4,5,5-tetramethyl-2-(spiro[4.5]dec-7-en-8-yl)-1,3,2-dioxaborolane (168 mg, 0.641 mmol) in MeCN (2 mL), ethyl 5-bromo-4-methylisoxazole-3-carboxylate (Intermediate A) (150 mg, 0.641 mmol) was added followed by K2CO3 (266 mg, 1.923 mmol), PdCl2(dppf).CH2Cl2 adduct (Alfa Aesar) (52.3 mg, 0.064 mmol) and water (1 mL). The vial was flushed with nitrogen, sealed and treated in the microwave (Biotage Smith Initiator) at 90° C. for 1 hour. The reaction mixture was partitioned between water (20 mL) and EtOAc (20 mL) and the organic phase was washed with brine (20 mL), dried over MgSO4, filtered and concentrated under reduced pressure to give an orange oil. The crude material was adsorbed onto silica and purification by chromatography eluting with 0-30% EtOAc in iso-hexane afforded the title compound;

Provenance & Evidence