Diels-Alder cycloadditions: 3-(<i>p</i>
-toluenesulfonyl)-2-propenal as dienophile
作者:Abdelkhalek Riahi、Jacques Muzart、Jean-Pierre Pete
DOI:10.1002/recl.19921110702
日期:——
The cycloadditions of 3-(p-toluenesulfonyl)-2-propenal with cyclopentadiene, 1,3-cyclo-hexadiene, 1-methoxy-1,3-cyclohexadiene, 1-(trimethylsilyloxy)-1,3-butadiene, or 1,3-diphenyliso-benzofuran have been easily carried out at room temperature in the absence of catalyst. In contrast, furan has led to a Michael-type addition. The basic elimination of the sulfonyl moiety of a cyclo-adduct has shown that
3-(对甲苯磺酰基)-2-丙烯醛与环戊二烯,1,3-环己二烯,1-甲氧基-1,3-环己二烯,1-(三甲基甲硅烷氧基)-1,3-丁二烯或1的环加成, 3-二苯基异苯并呋喃很容易在室温下在没有催化剂的情况下进行。相反,呋喃导致了迈克尔型的加成。环加合物的磺酰基部分的基本消除表明,该亲二烯体是丙炔的合成等价物。