159213-03-3Relevant academic research and scientific papers
Enantioselective synthesis and determination of the absolute configuration of the male sex pheromone of the parasitoid wasp: Urolepis rufipes
Grimm, Christopher,Melnik, Kristina,Ruther, Joachim,Schulz, Stefan,Wittbrodt, Johannes
, p. 3463 - 3465 (2020)
Males of the parasitoid wasp Urolepis rufipes use 2,6-dimethyl-7-octene-1,6-diol as a sex pheromone to attract virgin females. Herein, we determine the absolute configuration of the pheromone to be (2S,6S)-2,6-dimethyl-7-octene-1,6-diol (2S,6S-6) and present a stereoselective synthesis of the natural enantiomer of this new linalool derivative. In addition, we show that female wasps respond to the natural 2S,6S-6 stereoisomer while 2R,6S-6 is behaviorally inactive.
Structure-Elucidating Total Synthesis of the (Polyenoyl)tetramic Acid Militarinone C §
Brückner, Reinhard,Drescher, Christian,Hamburger, Matthias,Keller, Morris,Potterat, Olivier
supporting information, (2020/03/30)
The (polyenoyl)tetramic acid militarinone C (1) heads a family of seven members. Before our work, the configuration of C-5 was unknown whereas the configurations of C-8′ and C-10′ were either (R,R) or (S,S). We synthesized the four stereoisomers of constitution 1, which conform with these insights. This included cross-coupling both enantiomers of the western building block (8) with both enantiomers of the eastern building block (9). The specific rotations of the resulting 1 isomers suggested that natural 1 is configured like the coupling partners (S)-8 and (R,R)-9. This conclusion was corroborated by degrading natural 1 to alcohol 35 and by proving its configurational identity with synthetic (R,R)-35.
Enyne metathesis approach towards the cyclopentane motif of jatrophane diterpenes
Lentsch, Christoph,Fürst, Rita,Rinner, Uwe
supporting information, p. 2665 - 2670 (2014/01/06)
A short and efficient synthesis of the cyclopentane moiety of the jatrophane diterpene Pl-3 has been developed. The route features an enyne metathesis reaction, and a stereoselective palladium-catalyzed reductive epoxide opening as key steps. Georg Thieme Verlag Stuttgart New York.
Synthesis of methyl N-Boc-(2 S,4 R)-4-methylpipecolate
Hung, Kuo-Yuan,Harris, Paul W. R.,Brimble, Margaret A.
supporting information; experimental part, p. 8728 - 8731 (2011/02/26)
An efficient stereoselective synthesis of fully protected (2S,4R)-4-methylpipecolic acid has been developed. The synthesis was achieved by initial asymmetric α-alkylation of glycine with a chiral iodide, affording the linear precursor as a single stereoisomer. Subsequent aldehyde formation using OsO4/NaIO4 followed by immediate intramolecular cyclization afforded an enamine that was then subjected to hydrogenation to give the final compound in 23% yield over 10 steps.
General synthesis of highly functionalized cyclopentane segments for the preparation of jatrophane diterpenes
Lentsch, Christoph,Rinner, Uwe
supporting information; experimental part, p. 5326 - 5328 (2010/02/28)
Short and efficient syntheses of two diastereomeric cyclopentane segments present in most jatrophane diterpenes were achieved. Key steps are a stereoselective C-2 elongation, an RCM, and a hydroboration reaction. An orthogonal protecting group methodology
Synthesis of enantiopure bicyclic α,α-disubstituted spirolactams via asymmetric Birch reductive alkylation
Gueret, Stephanie M.,O'connor, Patrick D.,Brimble, Margaret A.
supporting information; experimental part, p. 963 - 966 (2009/07/11)
The synthesis of enantiopure bicyclic α,α-disubstituted spirolactams is described using a diastereoselective Birch reductive alkylation as the key step. Hydrogenation of the resultant alkylated cyclohexadienes followed by intramolecular cyclization provides access to enantiopure 8-azaspiro[5.6]dodecan-7-ones.
Total synthesis of tubulysin U and V
D?mling, Alexander,Beck, Barbara,Eichelberger, Uwe,Sakamuri, Sukumar,Menon, Sanjay,Chen, Quin-Zene,Lu, Yingchun,Wessjohann, Ludger A.
, p. 7235 - 7239 (2007/10/03)
Multicomponent method: Tubulysins are among the most potent cytotoxic agents known. Now the first total synthesis of some members has been achieved by utilizing a rapid three-component reaction for the synthesis of the unusual central thiazole amino acid
(+)-Sorangicin A synthetic studies. Construction of the C(1-15) and C(16-29) subtargets
Smith III, Amos B.,Fox, Richard J.,Vanecko, John A.
, p. 3099 - 3102 (2007/10/03)
(Chemical Equation Presented) Effective stereocontrolled syntheses of subtargets (-)-2 and (-)-4, comprising respectively the C(16-29) and C(1-15) tetrahydropyran and dihydropyran moieties of the potent antibiotic (+)-sorangicin A (1), have been achieved. The cornerstone for the synthesis of (-)-2 involved an aldol tactic exploiting 1,4-induction, followed in turn by an acid-mediated cyclization/ketalization and hydrosilane reduction promoted by TMSOTf, while construction of (-)-4 entailed a stereoselective conjugate addition/α-oxygenation sequence.
Estrogen receptor subtype-selective ligands: Asymmetric synthesis and biological evaluation of cis- and trans-5,11-dialkyl-5,6,11,12- tetrahydrochrysenes
Meyers, Marvin J.,Jun, Sun,Carlson, Kathryn E.,Katzenellenbogen, Benita S.,Katzenellenbogen, John A.
, p. 2456 - 2468 (2007/10/03)
We have recently reported that racemic 5,11-cis-diethyl-5,6,11,12- tetrahydrochrysene-2,8-diol (THC, rac-2b) acts as an agonist on estrogen receptor alpha (ERα) and as a complete antagonist on estrogen receptor beta (ERβ) (Sun et al. Endocrinology 1999, 1
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