Studies Towards a Concise Enantioselective Synthesis of Roseophilins
作者:Daniel J. Kerr、Bernard L. Flynn
DOI:10.1071/ch15407
日期:——
An oxazolidone auxiliary-controlled asymmetric Nazarov reaction has been applied to the synthesis of the cyclopentyl-fused pyrrole core of roseophilins. Additionally, a concise synthetic route to the pyrrole-furan biaryl fragment required in the synthesis of the recently isolated dechlororoseophilin is described. It is anticipated that these two syntheses can be combined in future efforts to provide
Total Synthesis and Structural Refinement of the Cyclic Tripyrrole Pigment Nonylprodigiosin
作者:Alois Fürstner、Jaroslaw Grabowski、Christian W. Lehmann
DOI:10.1021/jo991021i
日期:1999.10.1
total synthesis of the cyclic prodigiosin derivative 4 is described, which constitutes a potential lead compound for the development of immunosuppressive agents. The key steps of this approach comprise a palladium-catalyzed Suzuki cross coupling reaction of the rather unstable pyrrole boronic acid derivative 17 with the electron rich pyrrolyl triflate 15 followed by a ring-closingmetathesis reaction
The first intramolecular (4+3) cycloaddition of pyrroles with epoxy enolsilanes as the electrophiles was developed and used to generate optically‐enriched cycloadducts containing the nortropane substructure in good yields. Using this pyrrole cycloaddition as the key step, we achieved the asymmetric synthesis of a nortropane compound bearing the BCDEF ring structure common to the Class II galbulimima