Stereoselective preparation of (E)-epsilon-nitro-beta,gamma-unsaturated unsaturated methyl esters: Amberlyst A 27, using microwave, as superior catalyst for the 1,6-conjugate addition of nitroalkanes to methyl 1,3-butadiene-1-carboxylate
R. Ballini et al., Stereoselective preparation of (E)-epsilon-nitro-beta,gamma-unsaturated unsaturated methyl esters: Amberlyst A 27, using microwave, as superior catalyst for the 1,6-conjugate addition of nitroalkanes to methyl 1,3-butadiene-1-carboxylate, TETRAHEDR L, 42(48), 2001, pp. 8471-8473
1,6-Conjugate addition of nitroalkanes to methyl 1,3-b-atadiene-1-carboxyla
te, performed with Amberlyst A 27, using microwaves and in the absence of a
ny solvent, allows the prevalent formation of the beta,gamma -unsaturated a
dduct, over the alpha,beta -unsaturated one. The products were exclusively
obtained as (E)-isomers. (C) 2001 Elsevier Science Ltd. All rights reserved
.