Synthesis of Sulfur-Containing<i>Exo</i>-Bicyclic Dienes and Their Diels–Alder Reactions To Access Thiacycle-Fused Polycyclic Systems
作者:Thomas Castanheiro、Angèle Schoenfelder、Morgan Donnard、Isabelle Chataigner、Mihaela Gulea
DOI:10.1021/acs.joc.8b00213
日期:2018.4.20
a better stability to the thiacyclic diene compared to the simple 3,4-dimethylenetetrahydrothiophene. Their reactivity toward several dienophiles has been investigated, and various original thiacycle-fused polycyclic systems have been obtained with high or total diastereoselectivity. Moreover, they are the first exo-bicyclic dienes used in Diels–Alder reactions. The relative configurations of four
据报道,通过钯催化的硫连接的2-溴代乙炔的还原环化反应,空前的含硫的外双环的1,3-二烯类化合物进行了立体控制的合成。与简单的3,4-二亚甲基四氢噻吩相比,稠合的双环结构为噻环二烯提供了更好的稳定性。已经研究了它们对几种亲二烯体的反应性,并且已经获得了具有高或总非对映选择性的各种原始的硫环稠合的多环体系。此外,它们是Diels-Alder反应中使用的第一个外双环二烯。通过X射线晶体学分析已明确分配了四个环加合物的相对构型。环加成的机理细节已经通过计算手段进行了研究。