Sulfinyl Homo- and Hetero-Dienes from Sulfenic Acids: An Approach Towards Six-membered Nitrogen Heterocycles in Enantiomerically Pure Form
作者:Maria C. Aversa、Paola Bonaccorsi、Anna Barattucci、Maria C. Bilardo、Placido Giannetto
DOI:10.1055/s-2003-41076
日期:——
Two different synthetic pathways are presented that provide access to enantiopure sulfinyl hydrazones; in both addition of sulfenic acid/unsaturation represents the crucial step of the procedure. The obtained results are discussed in terms of regioselectivity in the formation of α- and/or β-sulfinyl α,β-unsaturated products when sulfenic acids are reacted with substrates showing carbonyl conjugated
Propynal hydrazones are successfully converted to the corresponding 3-aminoacrylonitriles in the presence of copper catalysts in good to high yields. As an example, (Z)-N-(hex-2-ynylidene)morpholin-4-amine reacted in the presence of 10 mol % Cu(OAc)2 in acetonitrile at 25 °C to afford (E)-3-morpholinohex-2-enenitrile ((E)-2 h) in 77% yield via C−N bond formation and subsequent β-elimination involving