Synthesis and evaluation of hapalosin and analogs as MDR-reversing agents
作者:Celeste E. O'Connell、Kathleen A. Salvato、Zhaoyang Meng、Bruce A. Littlefield、C.Eric Schwartz
DOI:10.1016/s0960-894x(99)00243-7
日期:1999.6
The marine natural product hapalosin and 22 analogs, which incorporated systematic substituent deletions or variations, were prepared. These compounds were evaluated in a cell-based assay for both MDR-reversing activity and general cytotoxicity. Some substituent modifications resulted in lower cytotoxicities, but most structural changes were either detrimental to or did not seriously alter the MDR-reversing
The first totalsynthesis of biselyngbyolide B, an 18-membered macrolide, was achieved. The 18-membered ring structure was constructed by esterification using the Shiina reagent and an intramolecular Stille coupling reaction.
Facile total synthesis of the antimalarial nonenolide
作者:Jian Liu、Ling Zhang、Jinmei He、Liuer He、Bowen Ma、Xinfu Pan、Xuegong She
DOI:10.1016/j.tetasy.2008.03.024
日期:2008.5
The facile totalsynthesis of the antimalarial nonenolide 1 is reported. The convergent strategy features the use of reactions such as Sharpless asymmetric dihydroxylation, aldol addition, Mitsunobu reaction, and ring-closing metathesis (RCM).
Synthetic studies on maduropeptin chromophore 2. Synthesis of the madurosamine aryl amide and the C1′C9′ fragments
作者:K.C. Nicolaou、Kazunori Koide、Jinyou Xu、Mark H. Izraelewicz
DOI:10.1016/s0040-4039(97)00724-7
日期:1997.5
A retrosynthetic analysis (Scheme I) of maduropeptin chromophore artifact I defined compounds 2 and 3 as required building block;. The construction of 2 was achieved starling from the 2,5-dimethyl derived aromatic acid 8 and the D-serine derived delta-lactone 12 (Scheme 2), whereas the synthesis of 3 utilized an Evans's aldol condensation reaction between aldehyde 13 and chiral auxiliary 14 (Scheme 3). (C) 1997 Elsevier Science Ltd.