3663-82-9Relevant articles and documents
Mild Intramolecular Ring Opening of Oxetanes
Deratt, Lindsey G.,Lawson, Edward C.,Wang, Chao-Yuan,Kuduk, Scott D.
, p. 9642 - 9645 (2019)
Oxetanes have been increasingly used as stable motifs in medicinal chemistry as well as versatile synthetic intermediates. Herein, an intramolecular ring opening of oxetane carboxamides with mild nucleophiles, such as nitrogen heterocycles, is presented. The reaction proceeds under metal-free basic conditions which is highly unusual in ring opening reactions of oxetanes. Amide formation and oxetane ring opening/cyclization in a one-pot approach affords high levels of molecular complexity in a single step from simple, readily available substrates.
One-pot preparation of chiral 2-vinyl-1,4-benzodioxane
Massacret, Magali,Goux, Catherine,Lhoste, Paul,Sinou, Denis
, p. 6093 - 6096 (1994)
2-Vinyl-1,4-benzodioxane was obtained with e.e. up to 45% by condensation of catechol and (Z)-2-butene-1,4-diylbis(methylcarbonate) in the presence of a catalytic amount of palladium(0) in association with chiral ligand such as BINAP.
An innovative synthesis pathway to benzodioxanes: The peculiar reactivity of glycerol carbonate and catechol
Tabanelli,Giliberti,Mazzoni,Cucciniello,Cavani
, p. 329 - 338 (2019/01/28)
A peculiar reactivity of glycerol carbonate (GlyC) as an innovative and highly reactive alkylating agent for phenolic compounds is investigated in this article. In particular, 2-hydroxymethyl-1,4-benzodioxane (HMB), a key intermediate for the pharmaceutical industry, has been selectively synthesized by the reaction of a slight excess of GlyC with catechol in the presence of a basic catalyst (NaOCH3, Na-mordenite, MgO), without requiring a reaction solvent. Both reagents have been quantitatively converted in just one hour at 170 °C with a HMB yield, up to 88%, in the presence of a homogeneous basic catalyst (NaOCH3). Notably, the main side product, the HMB isomer, may be an interesting intermediate for the synthesis of calone analogues, which are important scaffolds used in fragrances. A detailed mechanistic study, supported by kinetics, GC-MS, and HMBC NMR characterization, is also reported. Accordingly, this paper describes a completely innovative and greener synthesis pathway to benzodioxanes.
A sulfuric acid guanidine lives synthesis method
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Paragraph 0024; 0025; 0030; 0031, (2017/08/26)
The invention belongs to the technical field of organic drug synthesis, and particularly relates to a guanoxan sulfate synthesis method. The method comprises steps as follows: 1), 2-hydroxymethyl-1,4-benzodioxane and thionyl chloride have a chlorination reaction under the condition of existence of a solvent I, and 2-chloromethyl-1,4-benzodioxane is obtained; 2), 2-chloromethyl-1,4-benzodioxane and guanidine are condensed under the condition of existence of alkali and a solvent II, guanoxan is obtained, guanoxan and sulfuric acid are salified, and a finished product guanoxan sulfate is obtained. According to the guanoxan sulfate synthesis method, technological synthesis steps are simple, a route is short, raw material toxicity is relatively lower, and the yield and the purity of the product are high.