作者:P. Bravo、G. Gaudiano、P.P. Ponti、A. Umani-Ronchi
DOI:10.1016/s0040-4020(01)93002-9
日期:1970.1
Alkylation of several enamines by phenacyl or p-bromophenacyl bromide oxime affords the corresponding alkylated immonium salts III. Mild hydrolysis of these salts in most cases yields the unknown 6-hydroxy-4,5-dihydro-1,2,4H-oxazines (VI). Spectroscopic observation shows that some of these compounds exist in solution only in the cyclic form, some in a ring-chain tautomeric equilibrium with the corresponding
用苯甲酰基或对-溴苯甲酰基溴肟将几种烯胺烷基化,得到相应的烷基化铵盐III。在大多数情况下,这些盐的轻度水解会产生未知的6-羟基-4,5-二氢-1,2,4 H-恶嗪(VI)。光谱观察表明,这些化合物中的某些仅以环状形式存在于溶液中,某些与相应的γ-肟基羰基化合物V处于环链互变异构平衡中。当VI中存在两个不对称中心时,可在C处观察到快速差向异构化。 -6,大概是通过开放链的形式。已经研究了恶嗪VI的化学行为。当用三氟乙酸处理时,在这些恶嗪之一(VIg)上观察到Beckmann断裂。