Tetrahydroquinazoline-substituted chromones from Diels–Alder reaction of (E)-2-styrylchromones and pyrimidine ortho-quinodimethane
作者:Diana T. Patoilo、Artur M.S. Silva、Diana C.G.A. Pinto、Clementina M.M. Santos、Augusto C. Tomé、José A.S. Cavaleiro
DOI:10.1016/j.tetlet.2012.03.081
日期:2012.5
The Diels–Alder reaction of (E)-2-styrylchromones with a pyrimidineortho-quinodimethane is reported for the first time. These cycloaddition reactions afford mixtures of two regioisomeric tetrahydroquinazoline-substituted chromones in moderate to excellent global yields. Irrespective of the substituents on the 2-styrylchromones, the 2-(7-aryl-4-methoxy-2-methyl-5,6,7,8-tetrahydroquinazolin-6-yl)chromone
Synthesis of 5-Hydroxy-2-(naphth-2-yl)chromone derivatives
作者:Diana T. Patoilo、Artur M. S. Silva、Diana C. G. A. Pinto、Augusto C. Tomé、José A. S. Cavaleiro
DOI:10.1002/jhet.5570440617
日期:2007.11
The Diels-Alder reaction of 5-hydroxy-2-styrylchromones with ortho-benzoquinodimethane, generated “in situ” by thermal extrusion of sulfur dioxide from 1,3-dihydrobenzo[c]thiophene 2,2-dioxide, leads to 2-(3-aryl-1,2,3,4-tetrahydronaphth-2-yl)-5-hydroxychromones. These cycloadducts were dehydrogenated with DDQ, using classical thermal reflux conditions and microwave irradiation, affording the corresponding
5-羟基-2-苯乙烯基色酮与邻苯并醌二甲烷的Diels-Alder反应是通过热挤出1,3-二氢苯并[ c ]噻吩2,2-二氧化物产生的二氧化硫而“原位”生成的,导致2-( 3-芳基-1,2,3,4-四氢萘-2-基)-5-羟基色酮。使用经典的热回流条件和微波辐射,将这些环加合物用DDQ脱氢,以高收率(48-96%)得到相应的2-(3-芳基萘-2-基)-5-羟基色酮。