The first total synthesis of (−)-benzomalvin A and benzomalvin B via the intramolecular aza-Wittig reactions
作者:Toshiyuki Sugimori、Tomohiro Okawa、Shoji Eguchi、Akikazu Kakehi、Eiji Yashima、Yoshio Okamoto
DOI:10.1016/s0040-4020(98)00437-2
日期:1998.7
The first total synthesis of (−)-benzomalvin A, which possesses 4(3H)-quinazolinone and 1,4-benzodiazepin-5-one moieties, was described. Both of 6- and 7-membered ring skeletons were efficiently constructed by the intramolecular aza-Wittig reactions as the key reactions. The enantiomeric excess of synthetic (−)-benzomalvin A was more than 99.7% based on HPLC analysis using specially modified cellulose
描述了具有4(3 H)-喹唑啉酮和1,4-苯并二氮杂-5-基团的一个部分的(-)-苯并丙氨酸A的第一个全合成。通过分子内的氮杂-维蒂希反应作为关键反应,可以有效地构建6元和7元环骨架。基于使用特殊改性的纤维素作为固定相的HPLC分析,合成(-)-苯并丙氨酸A的对映体过量超过99.7%。此外,通过NMR研究和X射线晶体学分析对(-)-苯并马文敏A的特定构象动力学行为进行了研究,并且仅通过两步就容易地由(-)-苯并马文敏A合成苯并马文敏B。