Stereocontrolled Synthesis of Piperidine-Condensed Tricyclic Carbapenems (5-Azatrinems) and Their Antibacterial Activities.
作者:Makoto MORI、Atsushi SOMADA、Sadao OIDA
DOI:10.1248/cpb.48.716
日期:——
Stereocontrolled synthesis of tricyclic carbapenem (5-azatrinem) derivatives 4, in which a piperidine ring is condensed to the carbapenem skeleton, was achieved. The pivotal tricyclic intermediate 2, allyl (8S,9R,10S)-5-(tert-butoxycarbonyl)-10-(R)-1-(tert-butyldimethylsilyl oxy)ethyl]-11-oxo-1,5-diazatricyclo[7.2.0.0(3,8)]undec-2- ene-2-carboxylate, was synthesized starting from an acetoxyazetidinone
实现了立体控制的三环碳青霉烯(5-氮杂萘胺)衍生物4的合成,其中哌啶环稠合到碳青霉烯骨架上。关键的三环中间体2,烯丙基(8S,9R,10S)-5-(叔丁氧羰基)-10-(R)-1-(叔丁基二甲基甲硅烷氧基)乙基] -11-氧代-1,5-二氮杂三环[ 7.2.0.0(3,8)]十一烷基-2-烯-2-羧酸酯是由乙酰氧基氮杂环丁酮Chiron 6实际合成的,基于6与哌啶酮-酯5之间的CC键形成反应,钯催化的de通过乙二酰亚胺9进行7b的(烯丙氧基)羰基化和Wittig型环化。通过用三甲基甲硅烷基三氟甲磺酸盐和2,6-二甲基吡啶处理,可以顺利进行2的N-Boc基团的选择性脱保护,得到氨基化合物3,