Benzonitrile oxide cycloadds preferentially anti to the substituents of cis-3,5-di-X-cyclopentenes, where X = OMe, OAc, OCOPh, Br, Cl, and OH. Higher stereoselectivities are found for cis-2,5-di-X-2,5-dihydrofurans. The origins of these selectivities, and contrasts with acyclic and cyclobutene analogs, are described.
氧化
苯甲腈环优先与顺式3,5-二-X-
环戊烯的取代基抗衡,其中X = OMe,OAc,O
COPh,Br,Cl和OH。发现对顺式2,5-二-X-2,5-二氢
呋喃具有更高的立体选择性。描述了这些选择性的起源,以及与无环和
环丁烯类似物的对比。