How is 5-Chloro-3H-spiro[2-benzofuran-1,4'-piperidin]-3-one (CAS: 180160-47-8) typically synthesized?

5-Chloro-3H-spiro[2-benzofuran-1,4'-piperidin]-3-one (CAS: 180160-47-8) is synthesized via an electrophilic aromatic substitution reaction, where a piperidin ring is introduced onto a benzofuran ring. Commonly, it involves the use of an appropriate piperidin derivative and a chlorination step to introduce the chlorine substituent. The synthesis typically yields a high purity product with good selectivity and moderate to high yield.