10335-95-2Relevant articles and documents
DIALKYL ACYLPHOSPHONATES: A NEW ACYLATING AGENT OF ALCOHOLS
Sekine, Mitsuo,Kume, Akiko,Hata, Tsujiaki
, p. 3617 - 3620 (1981)
Diethyl benzoylphosphonate (1) underwent facile benzoylation of alcohols in the presence of DBU.Reactions of diols containing primary and secondary hydroxyl groups with 1 gave predominantly monobenzoates in which primary hydroxyl groups were highly selectively benzoylated.Related acylations were also described.
Selective Benzoylation of Diols with 1-(Benzoyloxy)benzotriazole
Kim, Sunggak,Chang, Heung,Kim, Wan Joo
, p. 1751 - 1752 (1985)
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An Efficient Method for the Chemoselective Preparation of Benzoylated 1,2-Diols from Epoxides
Khalafi-Nezhad,Soltani Rad,Khoshnood
, p. 2552 - 2558 (2003)
A very efficient and highly regioselective ring-opening reaction of epoxides with benzoic acid and its derivatives in the presence of cat. amount of tetrabutylammonium bromide (TBAB) in anhydrous acetonitrile has been developed. This effective method is useful for the preparation of selectively protected diols as precursor for many organic syntheses such as those of acyclic nucleosides and other synthetic purposes. The advantages of this method are efficiency, selectivity, low cost, and the applicability in large-scale synthesis of β-benzoyloxyalkanols.
Direct esterification of carboxylic acids with alcohols catalyzed by Iron(III) acetylacetonate complex
Weng, Shiue-Shien,Chen, Fong-Kuang,Ke, Chih-Shueh
, p. 2615 - 2621 (2013)
Direct condensation of carboxylic acids and alcohols with electronic, steric, and functional group variations was carried out using the environmentally benign, moisture-stable, inexpensive, and recoverable iron(III) acetylacetonate [Fe(acac)3] as catalyst (5 mol%). This iron salt efficiently catalyzed the esterification of several primary and secondary alcohols in refluxing xylene, without the need for a dehydration reagent. The chemoselectivity of the proposed protocol was demonstrated by the selective esterification of primary alcohol functionality in racemic 1-phenylethane-1,2- diol with benzoic acid. The esterification was also applicable to unmasked α-hydroxyacid, guasiaromatic, heterocyclic, and N-protected amino acids. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications to view the free supplemental file.
Directional migration method of benzoyl between hydroxyls based on sulfoacid catalysis
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Paragraph 0049-0053, (2020/02/14)
The invention discloses a directional migration method of benzoyl between hydroxyls based on sulfoacid catalysis, and relates to the technical field of chemical synthesis. Specifically, under the catalysis condition of sulphonic acid, the migration of acyl groups of the benzoyl is selectively completed through via of an ortho-ester intermediate in a high region, the characteristics of the migration are shown as follows: two hydroxyls of 5-ortho-ester rings or 6-ortho-ester rings can be formed in space, and the benzoyl can be migrated from secondary hydroxyls or tertiary hydroxyls to primary hydroxyls, and can be migrated from upright-position secondary hydroxyls to flat-position hydroxyls. According to the directional migration method disclosed by the invention, the sulfoacid is used for promoting acyl functional groups in a substrate to generate a 1,2-migration reaction or 1,3-migration reaction, the whole synthesis reaction condition is mild, the operation is simple, and atoms are economic.
Regioselective Sulfonylation/Acylation of Carbohydrates Catalyzed by FeCl3 Combined with Benzoyltrifluoroacetone and Its Mechanism Study
Dong, Hai,Liu, Yu,Lv, Jian,Zhu, Jia-Jia
, p. 3307 - 3319 (2020/03/25)
A catalytic amount of FeCl3 combined with benzoyl trifluoroacetone (Hbtfa) (FeCl3/Hbtfa = 1/2) was used to catalyze sulfonylation/acylation of diols and polyols using diisopropylethylamine (DIPEA) or potassium carbonate (K2CO3) as a base. The catalytic system exhibited high catalytic activity, leading to excellent isolated yields of sulfonylation/acylation products with high regioselectivities. Mechanism studies indicated that FeCl3 initially formed [Fe(btfa)3] (btfa = benzoyl trifluoroacetonate) with twice the amount of Hbtfa under basic conditions in the solvent acetonitrile at room temperature. Then, Fe(btfa)3 and two hydroxyl groups of the substrates formed a five- or six-membered ring intermediate in the presence of the base. The subsequent reaction between the cyclic intermediate and a sulfonylation reagent led to the selective sulfonylation of the substrate. All key intermediates were captured in the high-resolution mass spectrometry assay, therefore demonstrating this mechanism for the first time.