Chalcogeno Morita−Baylis−Hillman Reaction of 2-(Methylchalcogeno)phenyl Vinyl Ketones with Aldehydes, Ketones, andα-Dicarbonyl Compounds
作者:Hironori Kinoshita、Sayaka Kinoshita、Yukari Munechika、Tatsunori Iwamura、Shin-ichi Watanabe、Tadashi Kataoka
DOI:10.1002/ejoc.200300546
日期:2003.12
Reactions of 2-(methylchalcogeno)phenyl vinyl ketones 1 and 4 with aldehydes 5 were conducted in the presence of BF3·Et2O. The reaction was quenched by addition of Et3N and gave the Morita−Baylis−Hillman adducts 6−7 in good yields. When the reaction mixture of 1 with 5a was worked up with saturated aqueous NaHCO3, the sulfonium salt 8a was obtained together with 6. Ketones 10, α-diketones, and α-oxo
2-(甲基硫属元素)苯基乙烯基酮1和4与醛5的反应在BF3·Et2O存在下进行。通过添加 Et3N 淬灭反应并以良好的产率得到 Morita-Baylis-Hillman 加合物 6-7。当 1 与 5a 的反应混合物用饱和 NaHCO3 水溶液后处理时,锍盐 8a 与 6 一起获得。酮 10、α-二酮和 α-氧代酯 13,它们在传统的 Morita-Baylis-中几乎不反应。 Hillman 反应,类似地与 2-(甲基硫属元素)苯基乙烯基酮 1 和 4 反应,得到 Morita-Baylis-Hillman 加合物 11-12 和 14-15。硒代色满酮 9 和 16 与硒代衍生物 4 的反应以及 7 和 15 一起获得,5 和 13 作为副产物。讨论了锍盐syn-trans-8a的形成机理。(© Wiley-VCH Verlag GmbH & Co.