Molybdenum- and Tungsten-Based Coordination Polymers as Catalysts for an Efficient and Rapid Synthesis of Hexahydro-5-oxoquinoline-3-carboxylates and 1,4-Dihydropyridine-3,5-dicarboxylates
rapidly (2 min) in the presence of molybdenum‐ and tungsten‐based coordination polymers [M(Bu3Sn)2O4)]n (M=Mo or W) as catalysts (Schemes 1 and 2; Tables 2 and 3). The products were formed at room temperature in excellent yields (90–98%). The catalysts worked under heterogeneous conditions and were recyclable. The earlier reports for the application of these polymers to conduct organic synthesis are
在基于钼和钨的配位聚合物[M(Bu 3 Sn)2 O 4)] n(M = Mo或W)作为催化剂(方案1和2;表2和3)。产品在室温下以优异的收率(90–98%)形成。催化剂在非均相条件下工作且可回收。这些聚合物用于进行有机合成的早期报道是有限的。本方法探索了这些催化剂的新的有用的应用。
Catalyst-free efficient synthesis of polyhydroquinolines using polyethylene glycol as a solvent and evaluation of their cytotoxicity
作者:Humani Paidepala、Siddavatam Nagendra、Venkateswarlu Saddanappu、Anthony Addlagatta、Biswanath Das
DOI:10.1007/s00044-013-0706-1
日期:2014.2
AbstractAn eco-friendly one-pot synthesis of polyhydroquinolines by four-component coupling of aldehydes, dimedone, ethylacetoacetate, and ammonium acetate using polyethyleneglycol as a solvent at room temperature has been accomplished. The conversion was complete within 2–4 h, and the products were formed in high yields (83–95 %). No any additional catalyst was required. Several known and unknown