α,β-Unsaturated Carboxylic Acid Derivatives. XVI. Synthesis and Configuration of Diels-Alder Adducts from Ethyl 3-Nitro-2-alkenoate and 1,3-Butadiene
作者:Chung-gi Shin、Masanori Yamaura、Eiji Inui、Yuzuru Ishida、Juji Yoshimura
DOI:10.1246/bcsj.51.2618
日期:1978.9
The Diels-Alder reaction of individual (E)- and (Z)-isomers of ethyl 3-nitroacrylate and 3-nitrocrotonate with 1,3-butadiene, 1-acetoxy- or 1,4-diacetoxy-1,3-butadiene was conducted to give ethyl 6-nitro-3-cyclohexene-, 5-acetoxy-, and 2,5-diacetoxy-6-nitro-3-cyclohexene-carboxylates, respectively. The stereochemistry of the cycloaddition products has been elucidated by analysis of the NMR spectrum
3-硝基丙烯酸乙酯和 3-硝基巴豆酸乙酯的单独 (E)-和 (Z)-异构体与 1,3-丁二烯、1-乙酰氧基-或 1,4-二乙酰氧基-1,3-丁二烯的 Diels-Alder 反应是分别得到6-硝基-3-环己烯-、5-乙酰氧基-和2,5-二乙酰氧基-6-硝基-3-环己烯-羧酸乙酯。环加成产物的立体化学已通过核磁共振谱分析阐明。