Novel and efficient approach to (Z)-4-trifluoroethylidene-1,3-dioxolane derivatives via (trifluoromethyl)ethynylation of ketones and aldehydes
作者:Sung Lan Jeon、Ji Hoon Choi、Jung Ah Cho、Bum Tae Kim、In Howa Jeong
DOI:10.1016/j.jfluchem.2008.05.021
日期:2008.10
the reaction of new stable (trifluoromethyl)ethynylation reagent 1a with TBAF at −15 °C for 10 min, followed by treatment with phenyl perfluoroalkylated ketones at room temperature. The use of aldehydes under the same reaction condition afforded 1,3-dioxolanes 2q–r in good yields. The reaction of 1a with TBAF, followed by treatment with aldehydes or ketones at −15 °C for 10 min and then with trifluoroacetophenone
新的稳定的(三氟甲基)乙炔化试剂1a与TBAF在-15°C下反应10分钟,然后在室温下用苯基全氟烷基化的酮处理,从而以定量收率制备了全氟烷基化的4-trifluoroethylidene-1,3-dioxolanes 2a–p。温度。在相同的反应条件下使用醛可提供高产率的1,3-二氧戊环2q-r。1a与TBAF反应,然后在-15°C下用醛或酮处理10分钟,然后在室温下用三氟苯乙酮处理,得到1,3-二氧戊环衍生物2s–t丰产。四丁基铵trifluoropropynylide [II]在-15℃下用苯甲醛衍生物处理10分钟,接着用三氟,得到相应的1,3-二氧戊环2U-Z和1,3-二喔星3U-Z具有不同的反应条件。