A simple and efficient palladium-catalyzed intramolecular carbonylativesynthesis of isocoumarins and phthalides from the easily available starting materials by employing phenylformate as a CO surrogate has been achieved. The approach affords target compounds in good to excellent yields with the advantages of lower toxicity, milder conditions, easy operation and wide functional group tolerance.
novel nickel catalyst for the reaction of tert-butyl isocyanide insertion was discovered. In this approach, 1,2-bis(diphenylphosphino)ethane (L3) serves as an efficient ligand, thereby allowing the preparation of lactones from (o-bromophenyl)phenylethanone derivatives. It is noteworthy that this is the first example of nickel acting as a metal catalyst in the reactions of tert-butyl isocyanide insertion
Compounds of formula I:
are antagonists of the human 5-HT
2A
receptor, and hence useful in treatment or prevention of a variety of neurological conditions.
式I的化合物:是人类5-HT2A受体的拮抗剂,因此在治疗或预防各种神经系统疾病方面很有用。
5-HT2A receptor ligands
申请人:Merk Sharp & Dohme Ltd.
公开号:US07094777B2
公开(公告)日:2006-08-22
Compounds of formula I:
are antagonists of the human 5-HT2A receptor, and hence useful in treatment or prevention of a variety of neurological conditions.