33886-26-9Relevant articles and documents
Synthesis of N-Cyanodithiocarbonimidic Acid Derivatives
Ried, Walter,Broft, Gert W.
, p. 274 - 278 (2007/10/02)
The nucleophilic dithiocarbonimidic acid derivatives 2a-e and the isothiourea 2f react with the α-D-glucopyranosyl bromide 1 to yield the corresponding esters 3a-f (cf.Scheme 1). 2a gives with the 3-hexenopyranos-2-ulosyl chloride 4 the ester 5b.Bis(bromomethyl)quinoxaline (8) yields with 2a-c the esters 10a-c (cf.Scheme 2).The reaction of the dipotassium salt 6 with 4 provides di-O-benzoylkojic acid (7), and with 8 the cyclic N-cyanodithiocarbonimidate 9 is obtained.
Coordinative Role of Alkali Cations in Organic Reactions. IV. Benzoylation, Phenacylation, and Benzylation of Kojic Acid
Poonia, Narinder S.,Arora, Ashok K.,Bajaj, Amritlal V.
, p. 569 - 570 (2007/10/02)
Using kojic acid (5-hydroxy-2-hydroxymethyl-4-pyrone) as a substrate, the title reactions were carried out with various alkali metal hydroxides.Whereas phenacylation (with KOH or NaOH) and benzylation (with KOH, NaOH, or LiOH) are possible only on the phenolic hydroxyl, benzoylation can be carried out selectively as well as collectively on both the hydroxyl group (in 80percent aq.EtOH).The results were discussed in terms of the interactive role of alkali cations with the substrate.