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
with the allylic double bond being created subsequently (Knoevenagel condensation or dehydrohalogenation). Titanium-mediated cyclopropanation of homoallyl alk-2-enoates, on the other hand, directly provided the corresponding Z diastereomers. Palladium(0)-catalysed azidation of their sulfonic esters (tosylate, mesylate), azide reduction, and subsequent double bondcleavage afforded (E)- or (Z)-2-alkyl-2
Synthesis of the propionates of (2r, 8r)- and (2s, 8r)-8-methyl-2-decanol, the pheromone of the western corn rootworm, employing chiral compounds of microbial origin as starting materials
作者:Kenji Mori、Hindenori Watanabe
DOI:10.1016/s0040-4020(01)91175-5
日期:1984.1
The attractants of the western corn rootworm (Diabrotica virgiferaLe Counte), the propionates of (2R, 8R)-and (2S, 8R)-8-methyl-2-decanol, were synthesized from (R)-(+)-citronellol and the enantiomers of ethyl β-hydroxybutryate of microbial origin.
由(R)-(+)-香茅醇合成西部玉米根虫(Diabrotica virgifera Le Counte)的引诱剂,(2R,8R)-和(2S,8R)-8-甲基-2-癸醇的丙酸酯。和微生物来源的β-羟基丁酸乙酯的对映体。
A Facile Total Synthesis of Neurotrophic Metabolite (+/-)-Neuchromenin
作者:Josierika Ramos、Tanus Nagem、Jason Taylor
DOI:10.2174/15701786113106660088
日期:2014.2
The synthesis of (+/-)-neuchromenin, a known natural product that induces neurite outgrowth of PC12 cells, is
described. The total synthesis involved constructing a chromone ring from sesamol and coupling this intermediate to an
aldehyde by a Morita-Baylis-Hillman reaction (MBH). The MBH adduct was cyclized under acidic conditions followed
by removal of a methylene group to afford (+/-)-neuchromenin in 9 steps from sesamol.
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.