An improved Synthesis of Methyl (<i>E</i>)-5-Nitro-2-Pentenoate
作者:Richard A. Bunce、J. Travis Parker
DOI:10.1080/00397919208055414
日期:1992.1
Abstract A two-step synthesis of methyl (E)-5-nitro-2-pentenoate involving addition of nitrous acid to acrolein followed by Wittig olefination is described. The preparation can be routinely carried out on a 0.1 mole scale to afford the title compound in 45–50% overall yield as a 92:8 mixture of the E:Z double bond isomers.
A highly enantioselective organocatalytic one-potsynthesis of nitro-, formyl-, and ester-functionalized cyclopentanes with fourstereocenters is presented. The cyclopentanes were formed as a predominant diasteroisomer and isolated in high yields with 97-99 % ee.