Asymmetric Hydroformylation of Heterocyclic Olefins Catalyzed by Chiral Phosphine−Phosphite−Rh(I) Complexes
作者:Toshihide Horiuchi、Tetsuo Ohta、Eiji Shirakawa、Kyoko Nozaki、Hidemasa Takaya
DOI:10.1021/jo9624051
日期:1997.6.1
Asymmetric hydroformylation of heterocyclic olefins catalyzed by phosphine-phosphite-Rh(I) complexes has been investigated. Hydroformylation of symmetrical heterocyclic olefins such as 2,5-dihydrofuran, 3-pyrroline derivatives, and 4,7-dihydro-1,3-dioxepin derivatives afforded the optically active aldehydes as single products in 64-76% ee. Unsymmetrical substrates such as 2,3-dihydrofuran and N-(t
已研究了膦-亚磷酸酯-Rh(I)配合物催化的杂环烯烃的不对称加氢甲酰化反应。对称杂环烯烃(如2,5-二氢呋喃,3-吡咯啉衍生物和4,7-二氢-1,3-二氧杂环丁酮衍生物)的加氢甲酰化可在64-76%ee中将旋光性醛作为单一产物提供。不对称的底物,例如2,3-二氢呋喃和N-(叔丁氧羰基)-2-吡咯啉,给出了区域异构体的混合物。由N-(叔丁氧基羰基)-2-吡咯啉得到97%ee的N-(叔丁氧基羰基)吡咯烷-2-甲醛。2,5-二氢呋喃和N-(叔丁氧羰基)-3-吡咯啉的加氢甲酰化产物分别与2,3-二氢呋喃和N-(叔丁氧羰基)-2-吡咯啉的加氢甲酰化产物具有相反的构型。同样的催化剂。新型膦亚磷酸酯配体(R,S)-3 3'-Me(2)-BINAPHOS [=(R)-2-(二苯基膦基)-1,1'-联萘-2'-基(S)-3,3'-二甲基-1,1'-联萘-制备了2,2'-亚磷酸二乙酯],并用NMR光谱表征了其氢化铑络合物。使用(R,S)-3