Effective Conversion of Three Diacetyl‐<i>C</i>‐(β‐<scp>D</scp>‐Glycopyranosyl) Phloroglucinols to Spiroketal Derivatives by Refluxing in Water
作者:Shingo Sato、Masahiro Miura、Takashi Sekito、Toshihiro Kumazawa
DOI:10.1080/07328300802030811
日期:2008.5
and ‐allopyranosides in water for 1 d gave two kinds of spiroketal derivatives in total yields of 77%, 74%, and 64%, respectively. The structure and stereochemistry of the six new spiro(benzofuran‐[2H]pyran and ‐[2H]furan) derived from galactoside and alloside were verified by NMR analysis. The production ratios of the spiro derivatives were measured by HPLC analysis at regular time intervals. Since the
二乙酰间苯三酚C-β-D-葡萄糖,半乳糖和阿洛吡喃糖苷在水中回流1 d可得到两种螺环酮衍生物,总产率分别为77%,74%和64%。核磁共振分析验证了由半乳糖苷和别水苷衍生的六种新螺(苯并呋喃-[2H]吡喃和-[2H]呋喃)的结构和立体化学。以规则的时间间隔通过HPLC分析测量螺环衍生物的产率。由于大部分螺(苯并呋喃-[2H]呋喃)是在回流8到12小时后产生的,而大部分螺(苯并呋喃-[2H] pyran)是在回流2天后产生的,因此推测螺吡喃和螺吡喃的形成是分别由动力学和热力学控制的反应。