2022年8月30日
New J. Chem.の表紙になりました！
Base-induced isomerization of red uroleuconaphins revisited: Characterization and absolute stereochemistry of the yellow aphid pigments uroleuconaphins A2 and B2
Chiharu Ozakai, Kei Kitamura, Mitsuyo Horikawa, Tetsuto Tsunoda, Hiroto Kaku
New J. Chem., 2022, 46, 16256-16259. DOI:10.1039/D2NJ02676G
Abstract: We present herein the base-induced isomerization of red uroleuconaphins A1 and B1 to yellow uroleuconaphins A2 and B2, respectively. Based on our preliminary results, we optimized the conversion conditions by the extensive screening of bases to give the desired products in high yield. These yellow pigments were dimethylated using TMSCHN2 for stabilization, thereby enabling the separation of the diastereomers at C10a. The absolute stereochemistry of the yellow uroleuconaphins was determined by comparison with natural isolated samples.
塩基性条件下にアブラムシのもつ赤色色素を黄色色素へ変換しました。