The synthesis of 2,4-dienyl fluoroalkyl ketones by a tandem three-stage sequence of propargyl 2-fluoroalkylvinyl ether formation, Claisen rearrangement, and allene-to-conjugated diene isomerization
作者:Weimin Peng、Shizheng Zhu
DOI:10.1016/s0040-4020(03)00663-x
日期:2003.6
propargyl-allenyl Claisen rearrangement and isomerization of the resultant 3,4-dienone to give 2,4-unsaturated fluoroalkyl ketones 4a-c (Z/E mixture). The reaction of ethyl α-per(poly)fluoroalkyl acetate 1 with 1-phenyl propargyl alcohol 5 in refluxing CH2Cl2 in the presence of the mixed base (Na2CO3/TEA) directly afforded the corresponding unsaturated fluoroalkyl ketone 6a-c in one pot. In the presence