- Synthesis of new chiral schiff bases containing bromo- and iodo-functionalized hydroxynaphthalene frameworks
-
Two series of chiral Schiff bases 3a-g and 4a-g containing bromo- and iodo-functionalized hydroxynaphthalene frameworks were conveniently prepared in acceptable to moderate yields by controlled halogenation of hydroxynaphthaldehyde and then condensation of the corresponding mono-, di-, and trihalohydroxynaphthaldehyde with the chiral amino alcohol. Except for 4d, the Schiff bases 3a-g, 4a-c, and 4e-g prepared in the present work have not been reported in literature so far, and they might be used as effective chiral inducers in some asymmetrically synthetic reactions.
- Wang, Ying,Wang, Mei,Wang, Yu,Chen, Yuee,Sun, Licheng
-
-
Read Online
- Method for preparing formate-type compound
-
The invention discloses a method for preparing a formate-type compound. The method comprises the following steps of: adopting an alcohol-type compound and 1,3-dihydroxyacetone as reaction raw materials, and under the existence of a composite catalyst and an oxidant, reacting for 2-48 hours in a reaction medium in a reactor at a reaction temperature of 25-100 DEG C so as to obtain the formate-typecompound. The method disclosed by the invention is simple, and is mild in reaction condition, and by the method, a target product can be obtained by low cost and high yield; the used catalyst has highcatalytic activity, and is easily separated from a reaction system to be repeatedly used; the whole process is environment-friendly, and the reaction raw material (1,3-dihydroxyacetone) is easily converted from a side product (glycerol) of biodiesel, so that the utilization of the glycerol is promoted.
- -
-
Paragraph 0039; 0047; 0048
(2018/07/30)
-
- Palladium-Catalyzed Carbonylative Synthesis of Aryl Formates under Mild Conditions
-
Aryl formates have been extensively applied as CO sources in CO-free carbonylation reactions. However, there are no catalytic synthetic procedures for their preparation. In this manuscript, we developed a convenient palladium-catalyzed procedure for the synthesis of aryl formates. Good yields were achieved under mild reaction conditions with formic acid as the formyl source. A formyl meeting: A convenient palladium-catalyzed carbonylation procedure for the synthesis of aryl formates is developed. Good yields are achieved under mild reaction conditions with formic acid as the formyl source.
- Jiang, Li-Bing,Li, Rui,Li, Hao-Peng,Qi, Xinxin,Wu, Xiao-Feng
-
p. 1788 - 1791
(2016/06/01)
-
- Orthoamides, LVI [1]. A new method of wide scope for the preparation of aryl formates
-
Aryl formates 4a-u, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 are prepared by formylation of hydroxyarenes 3a-u, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 with N,N-diformylacetamide (1) or triformamide (2), respectively, in fairly good yields. The reactions can be catalyzed by sodium diformamide or praseodymium(III) triflate. The thiolformate 28 was obtained analogously from 1-thionaphthol (27).
- Ziegler, Georg,Kantlehner, Willi
-
p. 1172 - 1177
(2007/10/03)
-
- The Baeyer-Villiger Oxidation of Aromatic Aldehydes and Ketones with Hydrogen Peroxide Catalyzed by Selenium Compounds
-
A series of organoselenium compounds was investigated as activators of hydrogen peroxide in the Baeyer-Villiger oxidation.As a result, a convenient and cheap method for transformation of aromatic aldehydes, having polycondensed ring systems or electron-donating substituents, and polymethoxy derivatives of acetophenone, into phenols was elaborated.This method utilizes hydrogen peroxide activated by areneseleninic acids, as oxidizing agent.
- Syper, Ludwik
-
p. 167 - 172
(2007/10/02)
-
- Bisphosphonic acids and esters
-
The present invention relates to hitherto unknown compounds of the formula I STR1 in which R1 is a straight or branched, saturated or unsaturated aliphatic or alicyclic C1 -C10 hydrocarbon radical, an aryl or an aryl-C1 -C4 -alkyl radical, R1 if desired being unsubstituted or substituted with straight or branched C1 -C4 -alkyl, amino, C1 -C4 -alkamino, di-(C1 -C4 -alkyl)-amino, carboxy, C1 -C4 -alkoxycarbonyl, hydroxy, C1 -C4 -alkoxy, phenoxy, mercapto, C1 -C4 -alkylthio, phenylthio, halogen, trifluoromethyl; R2 stands for hydrogen, C1 -C8 -alkyl, aryl-C1 -C4 -alkyl or halogen; X is O or S, and n is an integer from 0 to 2; with the proviso that R2 cannot be hydrogen or methyl if n=O and R1 is methyl. The compounds of the invention are valuable in the human and veterinary practice.
- -
-
-