Chemoselectivity in the Reaction of 2-Diazo-3-oxo-3-phenylpropanal with Aldehydes and Ketones
作者:Jiantao Zhang、Jiaxi Xu
DOI:10.1002/hlca.201200532
日期:2013.9
2‐diazo‐3‐oxo‐3‐phenylpropanal (1) with aldehydes and ketones in the presence of Et3N was investigated. The results indicate that 1 reacts with aromatic aldehydes with weak electron‐donating substituents and cyclic ketones under formation of 6‐phenyl‐4H‐1,3‐dioxin‐4‐one derivatives. However, it reacts with aromatic aldehydes with electron‐withdrawing substituents to yield 1,3‐diaryl‐3‐hydroxypropan‐1‐ones, accompanied
研究了在Et 3 N存在下2-重氮-3-氧代-3-苯基丙醛(1)与醛和酮反应的化学选择性。结果表明1与6-苯基-4 H形成时具有弱供电子取代基和环状酮的芳香醛发生反应-1,3-二恶英-4-一衍生物。但是,它与带有吸电子取代基的芳族醛反应生成1,3-二芳基-3-羟基丙烷-1-酮,在某些情况下还伴随着查尔酮衍生物。它不与具有强供电子取代基的线性酮,脂族醛和芳族醛发生反应。提出了形成1,3-二芳基-3-羟基丙-1-酮和查尔酮衍生物的机理。我们还尝试使1与其他不饱和化合物(包括各种烯烃和腈)以及累积的不饱和化合物(如N,N'-二烷基碳二亚胺,苯基异氰酸酯,异硫氰酸酯和CS 2)反应1。仅在N,N'-二烷基碳二亚胺,预期的环加成反应发生了。