Synthesis of harzialactone A and its isomers from d-glucose and assignment of absolute stereochemistry
摘要:
The synthesis of the marine metabolite (3R,5R)-harzialactone A 1 from D-glucose is described. Syntheses of all the isomers (3S,5R)-2, (3R,5S)-3 and (3S,5S)-4 of 1 are also described and the absolute stereochemistry for the natural product 1 is assigned unambiguously. (C) 2000 Elsevier Science Ltd. All rights reserved.
A new synthesis of harzialactone A together with itsstereoisomers was achieved starting from phenyl acetone. The key step of this new route is the kinetic bioresolution of racemic cis- and trans-isomers by recombinant Escherichia coli JM109 cells expressing Fusarium proliferatum lactonase gene (reFPL). Harzialactone A was isolated in excellent ee (>99%), while moderate to good enantioselectivities
A short synthesis of (+)-harzialactone A and (R)-(+)-4-hexanolide via proline-catalyzed sequential α-aminooxylation and Horner–Wadsworth–Emmons olefination of aldehydes
作者:Shriram P. Kotkar、Gurunath S. Suryavanshi、Arumugam Sudalai
DOI:10.1016/j.tetasy.2007.07.031
日期:2007.8
An efficient and short enantioselectivesynthesis of the antitumor marine metabolite, (+)-harzialactone A 1 and pheromone, (R)-(+)-4-hexanolide 2 using l-proline-catalyzed sequential α-aminooxylation and Horner–Wadsworth–Emmons olefination of the respective aldehydes is described.
Stereocontrolled Synthesis of Harzialactone A and Its Three Stereoisomers by Use of Standardized Polyketide Building Blocks
作者:Frederic Ballaschk、Yasemin Özkaya、Stefan F. Kirsch
DOI:10.1002/ejoc.202001046
日期:2020.10.15
The Harzialactone A synthesis utilizes a Horner–Wittig‐reaction of the chiral building block and benzaldehyde in the first step. The formed β‐hydroxy ketone can be selectively transformed into the syn‐ or anti‐diol, which is further converted into the desired natural compound by ozonolysis, cyclization and oxidation in one step.
Cascade Synthesis of Five-Membered Lactones using Biomass-Derived Sugars as Carbon Nucleophiles
作者:Sho Yamaguchi、Takeaki Matsuo、Ken Motokura、Akimitsu Miyaji、Toshihide Baba
DOI:10.1002/asia.201600307
日期:2016.6.6
We report the cascade synthesis of five‐membered lactones from a biomass‐derived triose sugar, 1,3‐dihydroxyacetone, and various aldehydes. This achievement provides a new synthetic strategy to generate a wide range of valuable compounds from a single biomass‐derived sugar. Among several examined Lewisacidcatalysts, homogeneous tin chloride catalysts exhibited the best performance to form carbon–carbon
Oxone®-Mediated Direct α-Hydroxylation of β-Dicarbonyl Compounds: Racemic Synthesis of Harzialactone A
作者:Marcus Sá、Marcos Peterle、Marcelo Marques
DOI:10.21577/0103-5053.20190082
日期:——
An environmentally benign method is described for the alpha-hydroxylation of malonates and cyclic analogues in aqueous medium at room temperature under mild conditions, based on the in situ generation of dimethyldioxirane through the combination of acetone and Oxon (R). This procedure was found to be substrate-dependent and was successfully performed to provide alpha-hydroxylated gamma-lactones. To demonstrate the synthetic potential of this mild alpha-hydroxylation, two different concise mutes were developed to synthesize harzialactone A in the racemic form with a moderate (3:1) diastereomeric ratio.