89015-46-3Relevant academic research and scientific papers
Total Synthesis and Antibiotic Properties of Amino-Functionalized Aromatic Terpenoids Related to Erogorgiaene and the Pseudopterosins
Greven, Tobias,Neud?rfl, J?rg-Martin,Rausch, Marvin,Schmalz, Hans-Günther,Schneider, Tanja,Schumacher, Christian Eric
, (2022/02/23)
Following a concept recently introduced by Hergenrother,[6] the present study addresses the question of whether certain antimicrobially active aromatic (marine) natural products can be converted into more potent broad-spectrum antibiotics by introducing an aminoalkyl side chain. To this end, phenolic mono- and sesquiterpenoids (incl. carvacrol, xanthorrhizol, and 7-hydroxycalamene) as well as the diterpenes 7-hydroxyerogorgiaene and 9-deoxypseudopterosin A were converted into amino-functionalized analogs that display either an amino-methyl or a 2-amino-ethoxy substituent in place of (or next to) the OH group. This was achieved either by Pd-catalyzed nitromethylation/reduction of the aryltriflates, by O-alkylation of the phenols with bromoacetonitrile and subsequent reduction, or by ortho-hydroxymethylation/amination. During the study, an efficient enantioselective total synthesis of 7-hydroxyerogorgiaene (8 steps, 29 % overall yield) and 9-deoxypseudopterosin A (9 steps, 30 % overall yield) was elaborated using an asymmetric cobalt-catalyzed hydrovinylation (91 % ee) of 3-methoxy-4-methyl-styrene as the chirogenic step. Other important C?C bond forming steps include a Pd-catalyzed Suzuki cross-coupling and diastereoselective Lewis acid-mediated cyclization reactions. A total of 16 amino derivatives of natural products were prepared and subsequently tested for their antibacterial properties. Some of the diterpene-derived amines showed high efficacy, not only against Gram-positive (S. aureus SG511, S. aureus HG003, B. subtilis 168; MIC=0.5 to 2 μg/ml), but also against Gram-negative bacterial strains (E. coli K12; E. coli I-11276b; MIC=8 to 32 μg/ml). This clearly supported the underlying working hypothesis.
Transition-Metal-Free Valorization of Biomass-derived Levulinic Acid Derivatives: Synthesis of Curcumene and Xanthorrhizol
Fu, Yao,Gong, Tian-Jun,Xu, Wen-Yan,Zhuo, Kai-Feng
, p. 884 - 891 (2020/12/13)
Levulinic acid (LA) is acknowledged one of the most promising biomass-derived platform molecules and can be transformed into various value-added chemicals. Here, we report a new reaction process for the valorization of LA derivatives under transition-meta
A short synthesis of bisabolane sesquiterpenes
Du, Zhen-Ting,Zheng, Shuai,Chen, Gang,Lv, Dong
experimental part, p. 8053 - 8061 (2011/11/05)
A facile total synthesis of three members of the bisabolane sesquiterpene family, namely (±)-curcumene, (±)-xanthorrhizol and (±)-curcuhydroquinone had been achieved in high overall yield. The synthesis used bromobenzene derivatives as starting materials.
Efficient total synthesis of racemic bisabolane sesquiterpenes curcuphenol and xanthorrhizol starting from substituted acetophenones
Montiel, Luisa E.,Zepeda, L. Gerardo,Tamariz, Joaquin
experimental part, p. 1261 - 1273 (2010/09/07)
A total synthesis of natural bisabolane sesquiterpenes curcuphenol (1) and xanthorrhizol (2) was developed by using the substituted acetophenones 4 and 5, respectively, as starting materials. The acetyl group of the latter was activated through ethoxycarb
A formal total synthesis of xanthorrhizol based on nucleophilic opening of vinyloxirane by arylcopper reagent
Nagumo, Shinji,Irie, Shigeyuki,Hayashi, Kazuhito,Akita, Hiroyuki
, p. 1175 - 1178 (2007/10/03)
A formal total synthesis of xanthorrhizol was achieved in short step sequence involving the nucleophilic opening of methyl 4,5-epoxy-(2E)-pentenoate (1) by arylcopper reagent.
A Short Synthesis of Xanthorrhizol
Rane, Rajshri K.,Desai, Uday V.,Mane, R. B.
, p. 572 - 573 (2007/10/02)
Reformatsky reaction of 3-methoxy-4-methylacetophenone (1) with ethyl 4-bromocrotonate (2) followed by hydrogenation over Pd-C in the presence of acetic acid gives ethyl 5-(3-methoxy-4-methylphenyl)hexanoate (4) in a high yield.Grignard reaction of 4 with
SYNTHESIS OF HYDROXYCADALENE AND HYDROXYCALAMENENE VIA 13-HYDROXYXANTHORRHIZOL, A POSSIBLE PRECURSOR OF PARVIFOLIN
Krause, Wolfgang,Bohlmann, Ferdinand
, p. 2575 - 2578 (2007/10/02)
Starting with an acetophenone derivative three sesquiterpenes, xanthorrhizol, hydroxycadalene and hydroxycalamenene were synthesized.The biomimetic formation of parvifolin could not be achieved.
