1402078-61-8Relevant articles and documents
Highly enantioselective organocatalytic formation of functionalized cyclopentane derivatives via tandem conjugate addition/α-alkylation of enals
Remes, Marek,Vesely, Jan
, p. 3747 - 3752 (2012/10/08)
An enantioselective tandem reaction between dialkyl 2-haloethylmalonates and aromatic enals catalyzed by secondary amine catalysts is described. The reaction proceeds through a Michael/α-alkylation reaction sequence to afford the final 1,1,2,3-tetrasubstituted cyclopentanes in good yields (up to 75%) with high diastereoselectivity and enantioselectivity (up to 20:1dr and 93%ee). Moreover, the Michael/α-alkylation reaction also proceeds with a low catalyst loading (5 mol-%) with only a slight influence on selectivity and O- and N-alkylation products were not observed. Chiral 1,1,2,3-tetrasubstituted cyclopentanes were easily synthesized under mild and simple conditions from α,β-unsaturated aldehydes and dialkyl 2-haloethylmalonates in good yields with high diastereoselectivities and enantioselectivities. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.