Reactivity of Chiral α-Amidoalkylphenyl Sulfones with Stabilized Carbanions. Stereoselective Synthesis of Optically Active 1-Aminopyrrolizidine
作者:Nicola Giri、Marino Petrini、Roberto Profeta
DOI:10.1021/jo048882y
日期:2004.10.1
functionalized allylzinc reagents react with opticallyactive α-amidoalkylphenyl sulfones to give N-carbamoylamino derivatives with variable levels of anti diastereoselectivity. Zinc enolates provide comparable results with respect to lithium enolates in terms of diastereoselectivity but afford β-amino ester derivatives in lower yield. The synthetic utility of the obtained chiral N-carbamoylamino esters is demonstrated
[GRAPHICS]A new entry to enantiopure 3-aminopyrrolidines was developed using a boron trifluoride-mediated rearrangement of 2-aminomethylazetidines. The method is quite general and produces rearranged products in good yield regardless of both substitution pattern and relative stereochemistry of the starting material. A concise stereocontrolled synthesis of (-)-absouline was achieved on the basis of this new method.