Camphor-DerivedN-Acryloyl andN-Crotonoyl Sultams: Practical Activated Dienophiles in AsymmetricDiels-alder Reactions. Preliminary Communication
作者:Wolfgang Oppolzer、Christian Chapuis、G�rald Bernardinelli
DOI:10.1002/hlca.19840670527
日期:1984.8.8
Starting from (+)-camphor-10-sulfonyl chloride (5), the crystalline sultam 8 was easily prepared. Lewis-acid-promoted Diels-Alder additions of the crystalline N-acry-loyl and N-crotonoyl derivatives 9 and 10, respectively, to cyclopentadiene and 1,3-butadiene at −130 to −78° furnished adducts 11, 12 and 17 with high chiral efficiency. Crystallization of the adducts and nondestructive removal of 8 gave
从(+)-樟脑-10-磺酰氯(5)开始,容易制得结晶阿片8。路易斯-酸-促进的狄尔斯-阿尔德结晶的添加Ñ -acry-loyl和Ñ -crotonoyl衍生物9和10,分别向环戊二烯和在-130 1,3-丁二烯至-78°布置的加合物11,12和17具有高手性效率。所述加合物和非破坏性拆卸的结晶8,得到任一醇13,14和18 IR酸19%的对映体纯度为19。在使用8的对映异构体作为辅助剂时,诱导的感觉相反。通过X射线衍射分析确定了10的结构。