Stereoselective Diels–Alder reactions of 3-phosphonopropenoyl derivatives of 1,3-oxazolidin-2-ones
作者:Eileen W.C. Cheng、Reena T. Mandalia、Majid Motevalli、Begum Mothia、Yashvant Patanwadia、Peter B. Wyatt
DOI:10.1016/j.tet.2006.09.099
日期:2006.12
5-diphenyl-1,3-oxazolidin-2-one auxiliary gave Diels–Alder adducts with several cyclic and acyclic dienes. The crystal structures of the main cyclohexa-1,3-diene and 2,3-dimethylbutadiene adducts formed during reactions in the presence of dialkylaluminium halides are consistent with a reaction, which is stereoselectively endo with respect to the carbonyl group and occurs on the less hindered face of the dienophile
已经制备了具有一般结构(EtO)2 P(O)CHCHCOX的亲二烯体,其中X表示恶唑烷酮手性助剂。使用(S)-4-异丙基-5,5-二苯基-1,3-恶唑烷基-2-酮助剂可以使Diels-Alder加合物具有多个环状和非环状的二烯。在二烷基卤化物的存在下的反应过程中形成的主环己-1,3-二烯和2,3-二甲基加合物的晶体结构是与反应,其是立体选择性地一致远藤相对于所述羰基和发生在少当铝在两个羰基基团之间螯合时,亲二烯体的受阻面。