Indium(III) chloride catalyzed one-potsynthesis of 12-aryl/alkyl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-one and 8,10-dimethyl-12-aryl-8,12-dihydro-7-oxa-8,10-diazabenzo[a]anthracene-9,11-dionederivatives have been achieved by three component cyclocondensation of aldehydes, β-naphthol and cyclic 1,3-dicarbonyl compounds under solvent free condition in high yields. P2O5 too has been found as an effective
氯化铟(III)催化一锅合成12-芳基/烷基-8,9,10,12-四氢苯并[ a ]氧杂蒽-11-one和8,10-二甲基-12-芳基-8,12-二氢通过醛,β-萘酚和环状1,3-二羰基化合物在无溶剂条件下的三组分环缩合,可以高产率获得-7-氧杂-8,10-二氮杂苯并[ a ]蒽-9,11-二酮衍生物。还发现P 2 O 5是实现该转化的有效催化剂。
Efficient Lactic Acid-catalyzed Route to Naphthopyranopyrimidines under Solvent-free Conditions
interesting heterocyclic scaffolds and libraries of biologicallyactive molecules. They have several notable advantageous feature such as flexibility, operational simplicity, simple purification of products, minimum reaction steps, time and energy savings, and a high degree of atom economy. In order to avoid the use of organic solvents, solventfree systems are also important for green chemical syntheses. Solvent-free
ZrOCl(2)/nano-TiO(2) has been used as an efficientcatalyst for the preparation of naphtho[1',2':5,6]pyrano[2,3-d]pyrimidine derivatives by the three-component reaction of aldehydes, β-naphthol and 1,3-dimethylbarbituric acid. The advantages of the reaction are solvent-free conditions, short reaction times, easy workup, good to excellent yields, and cost-effective and reusable catalyst.
Synthesis and in vitro evaluation of antioxidant activity of diverse naphthopyranopyrimidines, diazaanthra[2,3-d][1,3]dioxole-7,9-dione and tetrahydrobenzo[a]xanthen-11-ones
作者:Jitender M. Khurana、Anshika Lumb、Ankita Chaudhary、Bhaskara Nand
DOI:10.1039/c2ra22406b
日期:——
A green and efficient one pot three component protocol has been developed for the synthesis of naphthopyranopyrimidines, diazaanthra[2,3-d][1,3]dioxole-7,9-dione and tetrahydrobenzo[a]xanthen-11-ones in PEG-400 catalyzed by alum (KAl(SO4)2·12H2O). Single crystal X-ray diffraction studies have been performed for naphthopyranopyrimidine (5). The synthesized compounds were screened for in vitro antioxidant activity by DPPH scavenging assay and compounds 3 and 4 manifested profound antioxidant potential.
Iodine is found to be a highly efficient catalyst for the three-component coupling (3CC) of aldehydes, β-naphthol, and 1,3-dimethylbarbituric acid undersolvent-freeconditions to afford the corresponding 8,10-dimethyl-12-aryl-12H-naphtho[1′,2′5,6]pyrano[2,3-d]pyrimidine-9,11-diones in good yields with high selectivity. The use of readily available iodine makes this method very simple, convenient,
发现碘是无溶剂条件下醛,β-萘酚和1,3-二甲基巴比妥酸的三组分偶联(3CC)的高效催化剂,可提供相应的8,10-二甲基-12-芳基-12 H-萘并[1',2'5,6]吡喃并[2,3 - d ]嘧啶-9,11-二酮的收率高,选择性高。使用现成的碘使这种方法非常简单,方便且具有成本效益。