Concise synthesis of ω-fluoroalkylated ketoesters. A building block for the synthesis of six-, seven-, and eight-membered fluoroalkyl substituted 1,2-diaza-3-one heterocycles
作者:Wen Wan、Jie Hou、Haizhen Jiang、Yangli Wang、Shizheng Zhu、Hongmei Deng、Jian Hao
DOI:10.1016/j.tet.2009.03.029
日期:2009.5
were subsequently subjected as a fluorine-containing building block to the synthesis of 1,2-diaza-3-one heterocycles has been optimized. Trifluoromethyl substituted seven- and eight-membered 1,2-diazapinone 8, 1,2-diazocinone 10 were also obtained via this sequential reaction of δ- (or ɛ-) trifluoromethyl ketoesters with hydrazine hydrates in acidic condition. In contrast, the sequential reaction of
通过ω-氟代烷基化的酮酸酯4与10催化的肼5的缩合和闭环反应的顺序反应,向中小尺寸的氟代烷基取代的1,2-二氮杂-3-酮杂环骨架提供一种简明而通用的合成路线已经开发了–20 mol%的TsOH。对生物学上感兴趣的ω-氟代烷基化的酮酸酯4的实际制备方法进行了优化,随后将其作为含氟的结构单元进行1,2-二氮杂-3-酮杂环的合成。三氟甲基取代的七和八元1,2- diazapinone 8,1,2- diazocinone 10通过在酸性条件下δ-(或)-)三氟甲基酮酸酯与水合肼的这种顺序反应也可得到三氯甲烷。相反,在相同条件下,ω-氟代烷基化的δ-或δ-酮酸酯与芳基肼的顺序反应不会导致二氮杂pin酮和重氮酮的形成,相反,该反应提供了直接接触生物学上重要的2-氟代烷基的途径。 -吲哚-3-羧酸酯衍生物通过Fisher吲哚合成。