Concise synthesis of calystegines B<sub>2</sub> and B<sub>3</sub>via intramolecular Nozaki–Hiyama–Kishi reaction
作者:Hong-Yao Wang、Atsushi Kato、Kyoko Kinami、Yi-Xian Li、George W. J. Fleet、Chu-Yi Yu
DOI:10.1039/c6ob00697c
日期:——
The key step in the concise syntheses of calystegine B2 and its C-2 epimer calystegine B3 was the construction of cycloheptanone 8via an intramolecular Nozaki–Hiyama–Kishi (NHK) reaction of 9, an aldehyde containing a Z-vinyl iodide. Vinyl iodide 9 was obtained by the Stork olefination of aldehyde 10, derived from carbohydrate starting materials. Calystegines B2 (3) and B3 (4) were synthesized from
简洁地合成calystegine B 2及其C-2差向异构体calystegine B 3的关键步骤是通过分子内的Nozaki-Hiyama-Kishi(NHK)反应9(一种含有Z-乙烯基碘的醛)来构建环庚酮8。乙烯基碘化物9是通过醛10的斯托克烯化反应获得的,醛10是从碳水化合物原料中衍生出来的。由D-木糖和L合成Calystegines B 2(3)和B 3(4)。-阿拉伯糖衍生物分别经过11个步骤,具有优异的总收率(27%和19%)。
Synthesis of glycosylamines and glyconamides using molecular iodine
作者:Maxime B. Fusaro、Vincent Chagnault、Denis Postel
DOI:10.1016/j.tet.2012.11.027
日期:2013.1
We describe herein the synthesis of glyconamides and glycosylamines using molecular iodine on benzylated carbohydrates. During the improvement and the optimization of the direct oxidative amidation reaction, we also discovered the possibility to form glycosylamines with excellent yields and short reaction times in comparison with the previously reported procedures. Advantages of these methods are the