Wittig-Horner Reaction of Dimethyl Phthalide-3-phosphonates with Ketones: Synthesis of 3-Ylidenephthalides and Their Conversion to 2,2-Disubstituted Indan-1,3-diones Including Spirocyclic Compounds
作者:Mitsuaki Watanabe、Hitoshi Morimoto、Maya Tomoda、Umeka Iwanaga
DOI:10.1055/s-1994-25642
日期:——
The Wittig-Horner reaction of dimethyl phthalide-3-phosphonates with various ketones was investigated under the conditions: lithium bis(trimethylsilyl)amide (LHMDS) or sodium hydride in tetrahydrofuran, and cesium carbonate in isopropyl alcohol. The sequential treatment of the 3-ylidenephthalides with diisobutylaluminium hydride (DIBAL-H) and pyridinium dichromate (PDC) afforded 2,2-disubstituted indan-1,3-dione derivatives in modest to high overall yields.
研究了邻苯二甲酸二甲酯-3-膦酸盐与各种酮的 Wittig-Horner 反应,反应条件为:四氢呋喃中的双(三甲基硅)酰胺锂 (LHMDS) 或氢化钠,以及异丙醇中的碳酸铯。用氢化二异丁基铝(DIBAL-H)和重铬酸吡啶鎓(PDC)依次处理 3- 亚基酞,可以得到 2,2-二取代的茚-1,3-二酮衍生物,总产率从低到高不等。