CHLOROSULFONATION OF 9-ARYLOCTAHYDROXANTHEN-1,8-DIONES
摘要:
The 9-aryloctathydroxanthen-1,8-diones (3, 4-24) were prepared by reaction of cyclohexan-1,3-dione (1) with selected arylaldehydes. The xanthendiones (4-9, 11, 12, 18, 21, 22) were successfully reacted with chlorosulfonic acid, and the crude sulfonyl chlorides were converted into 15 sulfonamides (26-40) for screening as potential pesticides. Attempted chlorosulfonation of the xanthendiones (13-17) was unsuccessful. alpha-Methylcinnamaldehyde was reacted with cyclohexandione (1) to yield the corresponding xanthendione derivative (23). On the other hand, with o-methoxycinnamaldehyde an impure product formed and the p-methoxy isomer afforded the corresponding 2-arylpyran (25). The NMR spectral data of the compounds are briefly discussed.
Introduction of taurine (2-aminoethanesulfonic acid) as a green bio-organic catalyst for the promotion of organic reactions under green conditions
作者:Farhad Shirini、Nader Daneshvar
DOI:10.1039/c6ra15432h
日期:——
derivatives are simply prepared via a three-component reaction in the presence of taurine as the catalyst. All these reactions are performed in water, a green solvent. The advantages of using of taurine as the catalyst are it is environmentally friendly, low cost, commercially available, easy to separate from the reaction mixture, and has high reusability. Use of this catalyst results in acceptable reaction
Organocatalytic Sequential One-Pot Double Cascade Asymmetric Synthesis of Wieland−Miescher Ketone Analogues from a Knoevenagel/Hydrogenation/Robinson Annulation Sequence: Scope and Applications of Organocatalytic Biomimetic Reductions
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1021/jo070277i
日期:2007.7.1
practical and novel organocatalytic chemo- and enantioselective process for the cascade synthesis of highly substituted 2-alkyl-cyclohexane-1,3-diones and Wieland−Miescher (W−M) ketone analogs is presented via reductive alkylation as a key step. First time, we developed the one-step alkylation of dimedone and 1,3-cyclohexanedione with aldehydes and Hantzsch ester through an organocatalytic reductive alkylation
Preparation and study of the catalytic application in the synthesis of xanthenedione pharmaceuticals of a hybrid nano-system based on copper, zinc and iron nanoparticles
pharmaceutical derivatives from aldehyde and dimedone. Due to the magnetic behavior of the catalyst, the purification process is carried out with high convenience. Herein, a plausible mechanism for the catalytic process is suggested and reusability of the presented catalyst is also investigated. In this report, it has been well-proven that high reaction yields are obtained for xanthenedione derivatives under
Increased expression of efflux transport proteins confers the Multi DrugResistant (MDR) phenotype to drugresistant bacteria, which can be mitigated by effluxpumpinhibitors (EPI). EPI's have the dual advantage of restoring efficacy of antibiotics and retarding the evolution of drugresistant mutants. In this study, 17 heterocyclic derivatives synthesized by a polyethylenimine (PEI) catalyzed one-pot
A synthetic entry into fused pyran derivatives through carbon transfer reactions of 1,3-oxazinanes and oxazolidines with carbon nucleophiles
作者:Kamaljit Singh、Jasbir Singh、Harjit Singh
DOI:10.1016/0040-4020(96)00879-4
日期:1996.11
of various 2 substituted 1,3-oxazinanes 3 and 1,3-oxazolidines 4 with cyclic carbonnucleophiles viz. 5,5-dimethyl-1,3-cyclohexanedione and 1,3-cyclohexanedione furnish xanthene derivatives, whereas a Knoevenagel reaction proceeds with acyclic nucleophiles. In case of 4b and 4c, a unique synthesis of functionalised α-tetralones has emerged. Reactions of mixtures of cyclic and acyclic carbon nucleophiles