214483-47-3Relevant articles and documents
Total synthesis of everninomicin 13,384-1 - Part 1: Retrosynthetic analysis and synthesis of the A1B(A)C fragment
Nicolaou,Rodriguez, Rosa Maria,Mitchell, Helen J.,Suzuki, Hideo,Fylaktakidou, Konstantina C.,Baudoin, Olivier,Van Delft, Floris L.
, p. 3095 - 3115 (2007/10/03)
In this first of a series of four articles we introduce everninomicin 13,384-1 (1), a powerful antibiotic effective against drug resistant bacteria, as a target for total synthesis and discuss its retrosynthetic analysis. From the three defined fragments required for the synthesis (2: A1B(A)C fragment; 4: DE fragment; 5: FGHA2 fragment), we describe herein two approaches to the A1B(A)C block. The first strategy relied on an olefin metathesis reaction to construct a common intermediate for rings B and C, but was faced with final protecting group problems. The second, and successful approach, involved a 1,2-phenylsulfeno migration and a sulfur directed glycosidation procedure to link rings B and C, as well as an acyl fluoride intermediate to install the sterically hindered aryl ester moiety (ring A1). The final stages of the synthesis of the required 2-phenylseleno glycosyl fluoride 2 required introduction of a phenylseleno group at C-1 of ring C followed by a novel, DAST-promoted 1,2-migration to produce the desired 2-β-phenylseleno glycosyl fluoride moiety.
Synthesis of new Lichen tridepsides
Elix, John A.,Jayanthi, Vilas K.,McCaffery, Leslie F.,Yu, Jin
, p. 1045 - 1052 (2007/10/03)
The unambiguous total synthesis of ten O-methyl and/or C-hydroxy derivatives of gyrophoric acid (1) has been achieved by using the condensation of an appropriately substituted benzole acid and benzyl lecanorate (33) or benzyl 2-O-methyllecanorate (32) in the key step.
