Diisobutylaluminum hydride (DIBAL-H) reduces nitriles to give N-diisobutylaluminum imines, which were asymmetrically allylated with chirallymodifiedallylboronreagents. The corresponding chiral primary homoallylamines were obtained with up to 87% ee.
Asymmetric Synthesis of Homoallylamines by Nucleophilic Addition of Chirally Modified Allylboron Reagent to <i>N</i>-Borylimines
作者:Shinichi Itsuno、Ayako Yokoi、Shizue Kuroda
DOI:10.1055/s-1999-2996
日期:1999.12
One pot synthesis of enantioenriched homoallylamines from nitriles is described. Chirally modified allylboron reagents reacted with N-borylimines derived from partial reduction of nitriles with LiEt3BH to afford enantioenriched homoallylamines in up to 90% ee.
Toward a Versatile Allylation Reagent: Practical, Enantioselective Allylation of Acylhydrazones Using Strained Silacycles
作者:Richard Berger、Philippe M. A. Rabbat、James L. Leighton
DOI:10.1021/ja035001g
日期:2003.8.1
A highly practical method for the enantioselectiveallylation of acylhydrazones has been developed. The previously reported strained silacycle reagent 1 reacts with a wide variety of acylhydrazones to give the hydrazide products with good enantioselectivity (83-89% ee, typically). It has been demonstrated that the products may be isolated without chromatography by recrystallization in >/=98% ee.
Direct Catalytic Asymmetric Aminoallylation of Aldehydes: Synergism of Chiral and Nonchiral Brønsted Acids
作者:Hong Ren、William D. Wulff
DOI:10.1021/ja1110865
日期:2011.4.20
The development of a catalytic asymmetric method for the direct aminoallylation of aldehydes is described that gives high asymmetric inductions for a broad range of substrates including both aromatic and aliphatic aldehydes. This method allows for direct isolation of unprotected analytically pure homoallylic amines without chromatography. The unique catalyst system developed for this process involves