Analogues of insulin secretagogue (2S,3R,4S)-4-hydroxyisoleucine: synthesis by 1,3-dipolar cycloaddition reactions of chiral nitrones to alkenes
作者:Kaïss Aouadi、Erwann Jeanneau、Moncef Msaddek、Jean-Pierre Praly
DOI:10.1016/j.tetasy.2008.04.006
日期:2008.5
(2S,3R,4S)-4-Hydroxyisoleucine, found in fenugreek, is an insulin secretagogue molecule. Non-natural analogues of (2S,3R,4R)- and (2R,3S,4S)-4-hydroxyisoleucine were efficiently prepared by 1,3-dipolar cycloaddition reactions of chiral nitrones derived from either (−)- or (+)-menthone to alkenes. The cycloadducts, obtained via the exo-approach of the alkenes to the nitrone’s less hindered face, led
(2 S,3 R,4 S)-4-羟基异亮氨酸是胡芦巴中的一种胰岛素促分泌剂分子。(2 S,3 R,4 R)-和(2 R,3 S,4 S)-4-羟基异亮氨酸的非天然类似物通过衍生自任一(-- )-或(+)-薄荷烯成烯烃。经由烯烃的外向接近硝酮的受阻面而获得的环加合物在还原步骤和手性助剂的裂解后,以良好的总收率生成对映体非纯氨基酸。