Solid-Phase Synthesis of β-Lactams via the Ester Enolate−Imine Condensation Route
作者:Stefan Schunk、Dieter Enders
DOI:10.1021/ol0055465
日期:2000.4.1
The esterenolate-iminecondensationroute to beta-lactams via an immobilized ester enolate has been achieved for the first time. The key reaction in the synthesis is the cyclization of the resin bound ester dianion and an imine. Traceless cleavage from the T1-triazene linker system yields the desired beta-lactams.
Preparation of .beta.-lactams by the condensation of lithium ester enolates with aryl aldimines
作者:Charles Gluchowski、Lynn Cooper、David E. Bergbreiter、Martin Newcomb
DOI:10.1021/jo01305a008
日期:1980.8
Solid-Phase Synthesis of Monocyclic β-Lactam Derivatives
作者:S. Schunk、D. Enders
DOI:10.1021/jo0261552
日期:2002.11.1
Liquid-phase studies concerning the solid-phase synthesis of monocyclic beta-lactams via the esterenolate imine condensation route have been conducted utilizing triazene esters 1 and 2 as model compounds. Esters were attached to benzylamine resin 6 by a triazene linker employing the respective diazonium salts. Immobilized ester-enolates 8 and 10 were reacted with various imines and imine precursors to give polymer-bound beta-lactams 14 and 17 in different substitution patterns. Traceless cleavage from the triazene linker yields the desired beta-lactams 16 and 19.