[EN] METHOD OF FORMING OSELTAMIVIR AND DERIVATIVES THEREOF<br/>[FR] PROCÉDÉ DE FORMATION D'OSELTAMIVIR ET DE SES DÉRIVÉS ET APPLICATIONS CORRESPONDANTES
申请人:UNIV NANYANG
公开号:WO2009078813A1
公开(公告)日:2009-06-25
A process is provided for the synthesis of 4,5-diamino cyclohexene carboxylate ester (1): or a pharmaceutically acceptable salt thereof. R1 - R3 are a silyl-, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. R4, R11 and R12 are H, a silyl-group, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. 3,4-Dihydropyran compound (9): with R5 and R6 being suitable protecting groups, is reacted to form aldehyde (4): which is oxidized and converted to N-substituted carbamate (3): with R7 being a suitable protecting group. (3) is, via oxazolinidone (13): converted to azido carboxylate ester (2): and then to 4,5-diamino cyclohexene carboxylate ester (1).
β C–H di-halogenation <i>via</i> iterative hydrogen atom transfer
作者:Ethan A. Wappes、Avassaya Vanitcha、David A. Nagib
DOI:10.1039/c8sc01214h
日期:——
di-halogenation (iodination, bromination, and chlorination) of sp3 C–H bonds has been developed. This first example of β C–H di-halogenation is achieved through sequential C–H abstraction by iterative, hydrogen atom transfer (HAT). A double C–H functionalization is enabled by in situ generated imidate radicals, which facilitate selective N˙ to C˙ radical translocation and tunable C–X termination. The versatile