Synthesis of Vicinal 2,3-Dialkyl-6-hydroxybenzophenones by Titanium Tetrachloride Catalyzed Fries Rearrangement of 3,4-Dialkylphenyl Benzoates
作者:Robert Martin、Pierre Demerseman
DOI:10.1055/s-1992-26211
日期:——
The titanium(IV) chloride-mediated Fries rearrangement of 3,4-dialkylphenyl benzoates 1 yields mainly 4,5-dialkyl-2-hydroxybenzophenones 2 in high yield. We describe here a new access to the unknown vicinal 2,3-dialkyl-6-hydroxybenzophenones 3, which is based on the protection of the most reactive position of 1 by bromination.
钛(IV)氯化物介导的Fries重排反应使3,4-二烷基苯基苯甲酸酯1主要产生高产率的4,5-二烷基-2-羟基苯基酮2。我们在这里描述了一种通向未知的邻位2,3-二烷基-6-羟基苯基酮3的新方法,该方法基于通过溴化保护1中最活泼位置。