How is 8-(2,6-Diethyl-4-methylphenyl)-7-oxo-1,2,4,5-tetrahydro-7H-pyrazolo[1,2-d][1,4,5]oxadiazepin-9-yl pivalate (CAS: 243973-20-8) typically synthesized?

8-(2,6-Diethyl-4-methylphenyl)-7-oxo-1,2,4,5-tetrahydro-7H-pyrazolo[1,2-d][1,4,5]oxadiazepin-9-yl pivalate is synthesized via a multi-step process involving the formation of the key intermediate, followed by pivaloylation. The synthesis typically employs standard organic chemistry techniques such as reflux and stirring. High yields and good selectivity are achieved under controlled conditions with appropriate catalysts and reagents.