Lewis Acid-Promoted Nitroolefination of Enol Silyl Ethers via an Addition Elimination Process.
作者:Ji-Jun CHEN、Takeo KAWABATA、Hiroshi OHNISHI、Muhong SHANG、Kaoru FUJI
DOI:10.1248/cpb.47.394
日期:——
Lewis acid-promoted nitroolefination of enol silyl ethers has been developed. Enol ethers 1, 4, 5, and 6 derived from lactones and lactams furnished nitroolefines 2, 7, 8, and 9, respectively in 60-99% yields by the treatment with 3 in the presence of Lewis acids. Asymmetric nitroolefination of 5a and 6a with 12 gave 8a and 9a in 75% and 73% ee, respectively.
我们开发了路易斯酸促进的烯醇硅醚硝基油化反应。在路易斯酸存在下,用 3 处理从内酯和内酰胺中提取的烯醇醚 1、4、5 和 6,可分别得到硝基烯烃 2、7、8 和 9,收率为 60-99%。5a 和 6a 与 12 的不对称硝基油化反应分别产生了 8a 和 9a,ee 值分别为 75% 和 73%。