Synthesis and asymmetric diels-alder reactions of (S)-2-p-tolylsulfinyl-1,4-benzoquinone
作者:M.Carmen Carreño、Jose L Garcia Ruano、Antonio Urbano
DOI:10.1016/s0040-4039(00)99307-9
日期:1989.1
Optically pure (S)-2-p-tolylsulfinyl-1,4-benzoquinone (5) is readily obtained by deketalization of the corresponding quinone bisketal 4, synthesized by Andersen's type synthesis on 2-bromo-1,4-dimethoxybenzene (1) followed by anodic oxidation of the resulting sulfoxide. The Diels-Alder reaction of cyclopentadiene with 5 took place on C5-C6 dienophilic double bond showing high facial selectivity, which can
光学上纯净的(S)-2-对甲苯基亚磺酰基-1,4-苯醌(5)可通过相应的醌双缩酮4的缩酮化反应轻松获得,该缩酮是通过安徒生式合成方法在2-溴-1,4-二甲氧基苯上合成的(1)然后将所得亚砜进行阳极氧化。环戊二烯与5的Diels-Alder反应发生在C 5 -C 6双亲双键上,显示出高的面部选择性,可以通过使用不同的路易斯酸和总内向选择性将其反转。