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。