Synthetic studies of mycalolide B, an actin-depolymerizing marine macrolide: construction of the tris-oxazole macrolactone using ring-closing metathesis
Tris-oxazole macrolactone 2, a key intermediate of mycalolide B (1), which has 13 stereogenic centres, was synthesized through the use of ring-closing metathesis (RCM). The E/Z ratio of the RCM product 2 was reversed by the use of CH(2)Cl(2) and toluene, whereas a cross-metathesis reaction yielded the C1-C35 long-chain compound 19 in a highly E-selective manner. Thus, the loss of flexibility in aliphatic carbon chains and the steric hinderance of beta- and gamma-substituents of the C20 olefin in the precursor 11 may affect the stereoselectivity in RCM reactions. (C) 2010 Elsevier Ltd. All rights reserved.
Bennett, Frank; Knight, David W.; Fenton, Garry, Journal of the Chemical Society. Perkin transactions I, 1991, # 1, p. 133 - 140
作者:Bennett, Frank、Knight, David W.、Fenton, Garry
DOI:——
日期:——
An Efficient Chemoenzymatic Approach towards the Synthesis of Rugulactone
is a natural product isolated from the plant Cryptocarya rugulosa. It has shown very important biological activity as an inhibitor of the nuclear factor κB (NF-κB) activation pathway. A new chemoenzymatic approach towards the synthesis of rugulactone is presented here. The chirality, induced to the key intermediate by a stereoselective enzymatic reduction utilizingNADPH-dependentketoreductase, is
作者:Breunig, Jamie L.、Lin, You-Chen、Pierce, Joshua G.
DOI:10.1016/j.tetlet.2024.155132
日期:——
bacteria. Due to its promising activity but lack of chemical stability, thienamycin serves as inspiration for new synthetic antibiotic scaffolds. In this study, we report a nine-step enantioselective formalsynthesis of thienamycin. Our route utilizes an asymmetric reduction, enabled by NaBH and -tartaric acid, followed by a series of diastereoselective reactions to access the key azetidinone precursor to