Formation of Furan Derivatives from Phenacyl Bromides and Sodium Telluride; Attempted Extension to Coumarin Synthesis
作者:Seetharamaiyer Padmanabhan、Takuji Ogawa、Hitomi Suzuki
DOI:10.1246/bcsj.62.2114
日期:1989.6
The enolates, generated from phenacyl bromides by sodium telluride, yield 2,4-diarylfurans in addition to the expected dehalogenation products. No 1,4-dicarbonyl compounds could be isolated even in the presence of excess oxidizing agent, copper(II) chloride. Condensation of 2-(methoxymethoxy)arenecarbaldehydes with ethyl bromoacetate in the presence of sodium telluride gave the expected α,β-unsaturated
除了预期的脱卤产物外,由碲化钠从苯甲酰溴生成的烯醇化物还产生 2,4-二芳基呋喃。即使存在过量的氧化剂氯化铜 (II),也无法分离出 1,4-二羰基化合物。在碲化钠存在下,2-(甲氧基甲氧基)芳烃甲醛与溴乙酸乙酯的缩合得到预期的α,β-不饱和酯,其抵抗环化以产生所需的香豆素衍生物。尝试进行 2-(溴乙酰氧基) 苯甲醛的分子内 Reformatsky 型反应,仅得到 6,12-环氧-6H,12H-二苯并[b,f]-[1,5] 二恶星作为主要产物。