Synthesis 2009(3): 464-468  
DOI: 10.1055/s-0028-1083315
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Diastereoselective Synthesis of α-Stabilized Phosphorus Ylides via a Four-Component Reaction

Abdolali Alizadeh*a, Nasrin Zohreha, Long-Guan Zhub
a Department of Chemistry, Tarbiat Modares University, P. O. Box 14115-175, Tehran 18716, Iran
Fax: +98(21)88006544; e-Mail: abdol_alizad@yahoo.com; e-Mail: aalizadeh@modares.ac.ir;
b Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. of China
Further Information

Publication History

Received 29 July 2008
Publication Date:
09 January 2009 (online)

Abstract

Functionalized and α-stabilized derivatives of dialkyl 2-{1-[(alkylamino)carbonyl]-2-oxopropyl}-3-(1,1,1-triphenyl-λ5-phos­phanylidene)succinate were obtained in excellent yields from the reaction between primary amines, diketene, and dialkyl acetylenedicarboxylate in the presence of triphenylphosphine. Not only the reaction is diastereoselective but also the formed diasteromer has two rotamers that are in equilibrium with each other. ¹H, ¹³C, and ³¹P NMR showed only one of the two rotamers and thus conversion of Z-isomer into another is negligible at room temperature.

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CCDC 695672 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336 033; E-mail: mailto:deposit@ccdc.cam.ac.uk].