Synthesis of new tropinone derivatives by palladium-catalyzed couplings of 8-azabicyclo[3.2.1]oct-2-enyl nonaflates
作者:Ilya M. Lyapkalo、Jens Högermeier、Hans-Ulrich Reissig
DOI:10.1016/j.tet.2004.06.036
日期:2004.8
Alternatively, the one-pot nonaflation-Heck protocol starting from silyl enol ether 6 provided 8 in good yield. The couplings of acrylonitrile or phenyl vinyl sulfone were also performed with in situ generated 7 and they afforded the expected 1,3-dienes 9 and 10 in good yields. The Sonogashira-reaction with phenylacetylene also started from silyl enol ether 6 and provided enyne 11 via 7 in good yield. A Diels–Alder
肌钙蛋白衍生的壬酸酯3不适合用于Heck反应,而相关的氨基甲酸酯7是钯催化过程的优良底物。通过LDA处理酮5,然后用NfF(九氟丁烷磺酰氟)进行捕集,以高收率分离出壬酸酯7,或者通过甲硅烷基烯醇醚6与NfF的氟化物催化反应原位生成壬酸酯7。通过壬二酸酯7与丙烯酸甲酯的常规Heck反应,以几乎定量的产率制备所需的1,3-二烯8。备选地,提供从甲硅烷基烯醇醚6开始的一锅式非烧蚀-Heck方案8产量高。丙烯腈或苯基乙烯基砜的偶联也可以原位生成7进行,它们以良好的收率提供了预期的1,3-二烯9和10。与苯基乙炔的Sonogashira反应也从甲硅烷基烯醇醚6开始,并以高收率经由7提供了烯炔11。1,3-二烯8与N-苯基马来酰亚胺的Diels-Alder反应在100°C时可提供高收率的四环加合物12,具有非对映选择性,但内-外选择性低。九叶草14从相应的不饱和双环酮13容易获得。在尝试的Heck反应