由脱羧三溴化作用选择性地制备三溴甲基酮和三溴乙烯基衍生物。在AgOAc(10mol%)存在下,丙酸衍生物与二溴异氰尿酸(DBCA)/ H 2 O之间的反应主要得到三溴甲基酮衍生物。当用2,2,6,6-四甲基-1-哌啶基氧基(TEMPO)代替AgOAc进行相同的反应时,仅以高收率形成了三溴乙烯基衍生物。发现乙炔基溴是中间体。
Switchable Synthesis of α,α‐Dihalomethyl and α,α,α‐Trihalomethyl Ketones by Metal‐Free Decomposition of Enaminone C=C Double Bond
作者:Yunyun Liu、Jin Xiong、Li Wei、Jie‐Ping Wan
DOI:10.1002/adsc.201901234
日期:2020.2.21
(BPO) with mild heating, enabling the tunable synthesis of α,α‐dihalomethyl ketones and α,α,α‐trihalomethyl ketones under different reaction conditions. The formation of these divergent products involving featured C=C double bond cleavage requires no any metal reagent, and represents one more practical example on the synthesis of poly halogenated methyl ketones via the functionalization of carbon−carbon