Clarifying the structure of granadaene: Total synthesis of related analogue [2]-granadaene and confirmation of its absolute stereochemistry
作者:Miguel Paradas、Rocío Jurado、Ali Haidour、Javier Rodríguez Granger、Antonio Sampedro Martínez、Manuel de la Rosa Fraile、Rafael Robles、José Justicia、Juan M. Cuerva
DOI:10.1016/j.bmc.2012.09.017
日期:2012.11
first world. One of the most extended methods for its identification is based on the detection of a characteristic red pigment in the patient samples, named [12]-granadaene (1). In this article, we present a modular and flexible approach to simple analogues of this ornithine rhamno-polyene 1 and the elucidation of the most important features of its structure: the absolute configuration at C-27, the
was monitored in vitro. The impact of the type and configuration of the δ‐substituents was probed and it was found that amino‐substituted surrogates yield the corresponding lactams. A carboxamide analogue was transformed into a glutarimide unit, which can be found in many natural products. Our findings illuminate the biosynthesis of glutarimide‐bearing polyketides and also demonstrate the utility of this
作者:Gerhard Quinkert、Uwe Döller、Mathias Eichhorn、Frank Küber、Hans Peter Nestler、Heinrich Becker、Jan W. Bats、Gottfried Zimmermann、Gerd Dürner
DOI:10.1002/hlca.19900730724
日期:1990.10.31
Further Contributions to the Synthesis of (+)-Aspicilin
对(+)-Aspicilin合成的进一步贡献
Chiral synthesis of (R)-( -)-mellein and (3R,4aS)-( + )-ramulosin
作者:Kenji Mori、Ashok K. Gupta
DOI:10.1016/s0040-4020(01)96780-8
日期:——
By employing an intramolecular Diels-Alder reaction as the key-step, (R)-(—)-mellein 1a (a metabolite of Aspergittus melleus) and (3R,4aS)-( +)-ramulosin 2 (a metabolite of Pestalotia ramulosa) were synthesised from ethyl (R)-3-hydroxybutanoate 3a.
Enantioselective synthesis of the 13-membered macrodiolide bartanol
作者:John A. O'Neill、Stephen D. Lindell、Thomas J. Simpson、Christine L. Willis
DOI:10.1039/p19960000637
日期:——
The enantioselective synthesis of the unusual 13-membered ring macrodiolide bartanol 7 from poly[(R)hydroxybutyrate] is described confirming the 6R,11R,13R configuration of the natural product. The use of a novel ylide 29 with a MEM-ester protecting group is developed to enable a mild, one-pot cleavage of both the acid and alcohol protecting groups in 30 prior to macrocyclisation to the bartanol framework. The outcome of a Wittig chain extension reaction on a mixture of lactols 19 and 22 using this ylide was found to be dependent on the solvent.