It was found that 3-(p-tolylsulfonyl)- and 3-(p-tolylsulfinyl)-3-sulfolenes prepared from 3-sulfolene react with various dienophiles to give the corresponding Diels-Alder cycloadducts in good yields, and that only the “para” substituted cycloadducts are obtained with monofunctionalized (CHO, COCH3, CO2CH3, CN, and C6H5) ethylenes and methyl 2-methylpropenoate, respectively.
发现由 3-
环丁砜制备的 3-(p-tolylsulfonyl)- 和 3-(p-tolylsulfinyl)-3-sulfolenes 与各种亲二烯体反应,以良好的收率得到相应的 Diels-Alder 环加合物,并且只有“对”取代的环加合物分别用单官能化(CHO、COCH3、CO2CH3、CN和
C6H5)
乙烯和2-
甲基丙烯酸甲酯获得。