Diethyl 2-[cyano(toluene-4-sulfinyl)methylene]propanedioate and its Diels–Alder adduct with cyclopentadiene
作者:Rubén A. Toscano、Simón Hernández-Ortega、Benjamín Ortiz、Rubén Sánchez-Obregón、Fernando Walls、Francisco Yuste
DOI:10.1107/s0108270101012951
日期:2001.11.15
The thermal Diels-Alder cycloadditon reaction of diethyl 2-[cyano(toluene-4-sulfinyl)methylene]propanedioate, C(16)H(17)NO(5)S, with cyclopentadiene gave the pure racemates of two of the four possible diastereomers, with a complete pi-facial selectivity and a high (80:20) endo/exo-sulfinyl selectivity. X-ray diffraction studies of diethyl 2-[cyano(toluene-4-sulfinyl)methylene]propanedioate and the
2- [氰基(甲苯-4-亚磺酰基)亚甲基]丙二酸二乙酯,C(16)H(17)NO(5)S与环戊二烯的热Diels-Alder环己二酮反应,得到四个可能中的两个的纯外消旋物非对映异构体,具有完全的面部选择性和较高的内/外亚磺酰基选择性(80:20)。2- [氰基(甲苯-4-亚磺酰基)亚甲基]丙二酸二乙酯和环加成产物的主要异构体,即3-氰基-3-(甲苯-4-亚磺酰基)双环二乙基[2.2.1]的X射线衍射研究]庚-5-烯-2,2-二羧酸酯,C(21)H(23)NO(5)S,揭示丙烯腈部分上取代基的构象同时产生空间和电子效应,这会影响反应。