Catalytic Asymmetric Synthesis of Piperidine Derivatives through the [4 + 2] Annulation of Imines with Allenes
作者:Ryan P. Wurz、Gregory C. Fu
DOI:10.1021/ja053277d
日期:2005.9.1
there has been only very limited progress in achieving asymmetric catalysis with chiral phosphines. In this report, the first highly enantioselective variant of the Kwon annulation of imines with allenes is described. Thus, C2-symmetric chiral phosphepine 1 serves as an effective catalyst for this powerful process, furnishing an array of functionalized piperidine derivatives with very good stereoselectivity
Asymmetric catalytic aza-Morita–Baylis–Hillman reaction using chiral bifunctional phosphine amides as catalysts
作者:Ming-Juan Qi、Teng Ai、Min Shi、Guigen Li
DOI:10.1016/j.tet.2007.11.039
日期:2008.2
The asymmetric catalytic aza-Morita–Baylis–Hillmanreaction of N-sulfonatedimines with α,β-unsaturated ketones has been successfully conducted by using chiral bifunctionalphosphine amides as catalysts. A series of new chiral bifunctionalphosphine amides were designed, synthesized, and systematically studied for this asymmetric reaction. The corresponding aza-MBH adducts were obtained in good yields
Aza–Baylis–Hillman Reaction of <i>N</i>‐Tosylated Imines with Acrylamide or <i>N</i>‐Arylacrylamide
作者:Zhengang Wu、Guofu Zhou、Jieyu Zhou、Wei Guo
DOI:10.1080/00397910600781273
日期:2006.8.1
Abstract Acrylamide or N‐arylacrylamide could undergo aza–Baylis–Hillman addition reaction with N‐tosylated imines with phenol as additive and DABCO as catalyst in the absence of solvent.
Synthesis of Novel Functionalized<b><i>N</i></b>-Tosylaldimines
作者:James H. Wynne、Stacy E. Price、Jeffrey R. Rorer、Wayne M. Stalick
DOI:10.1081/scc-120015720
日期:2003.3
Condensation of a variety of aromatic aldehydes with p-toluenesul-fonamide in the presence of Lewis acids affords novel functionally varied aromatic N-tosylaidimines in good yields. A diverse array of aromatic aldehydes was examined, each containing a unique functionality. The new method reported here allows for incorporation of functionalities that are unavailable by existing methods.