Asymmetric synthesis of spiro 2-pyrrolidin-5-ones, 2-piperidin-6-ones and 1-isoindolin-3-ones. Part 2: N-Acyliminium ion cyclisations with an internal alkene nucleophile
作者:Abood A Bahajaj、John M Vernon、Giles D Wilson
DOI:10.1016/j.tet.2003.10.127
日期:2004.1
Chiral non-racemic bicyclic and tricyclic oxylactams obtained in two steps from N-(2-hydroxy-1(R)-phenylethyl)-succinimide and phthalimide are cyclised diastereoselectively in formic acid to give spiro[cyclohexane-1,2′-pyrrolidin]-5-ones and spiro[cyclohexane-1,1′-isoindolin]-3-ones, respectively.
由N-(2-羟基-1(R)-苯乙基)-琥珀酰亚胺和邻苯二甲酰亚胺分两步获得的手性非外消旋双环和三环氧基内酰胺在甲酸中非对映选择性环化,生成螺[环己烷-1,2'-吡咯烷丁]分别为-5-个和螺[环己烷-1,1'-异吲哚啉] -3-个。