Polyfunctionalized Pyrrolidines by Stereoselective 1,3-Dipolar Cycloaddition of Azomethine Ylides to Chiral Enones
摘要:
The cycloaddition reactions of chiral alpha,beta-unsaturated ketones substituted by alkoxy or amino groups in the gamma-position to azomethine ylides (obtained from glycine imines) were investigated in the presence of a base, LiBr and AgOAc. High regioselectivities were observed in most cases, resulting in the formation of a single diastereomer, particularly if a DBU/AgOAc catalyst system was employed. The influence of reaction conditions and olefin structure on the stereoselectivity of the reaction was investigated, and models rationalizing stereocontrol are proposed. In addition, an interesting deconjugation reaction of acetals derived from gamma,delta-dihydroxy alpha,beta-unsaturated enones or esters is described.
Synthesis of enantiomerically pure pyrrolidines by stereospecific cycloaddition of azomethine ylides with enones
作者:M. Pätzel、G. Galley、P.G. Jones、A. Chrapkowsky
DOI:10.1016/s0040-4039(00)73839-1
日期:1993.9
alkoxy or amino substituent in γ-position react with azomethine ylides 3 (obtained from glycine imines) in the presence of DBU/AgOAc giving enantiomerically pure pyrrolidine derivatives 4 in a stereospecific manner.
Diastereoselective 1,3-dipolar cycloaddition of nitrilimines to γ-oxygenated α,β-unsaturated enones and esters
作者:Lutz Grubert、Guido Galley、Michael Pätzel
DOI:10.1016/0957-4166(96)00119-x
日期:1996.4
stereochemical outcome of the 1,3-dipolarcycloaddition of nitrilimines to γ-oxygenated α,β-unsaturated enones and esters was investigated. By means of X-ray and NMR analysis the main diastereomers were assigned as the syn-derivatives. Novel enantiomerically pure nitrilimines were included in the investigations but did not influence the stereochemical course of the cycloaddition significantly.