The Reduction of Stereoisomeric 6-<i>tert</i>-Butyl-3-methoxy-3-methylcyclohexenes with Lithium in Ethylamine
作者:Tadashi Masamune、Hajime Matsue、Matsuo Fujii
DOI:10.1246/bcsj.45.1812
日期:1972.6
The synthesis and reduction with lithium in ethylamine of the entitled stereoisomeric allyl ethers 1 and 2 are described. The reaction of both the isomers occurred very readily with concomitant cleavage of the methoxy groups, and gave the same products, 4-tert-butyl-1 -methylcyclohexene (13), and c- and t-3-tert-butyl-6-methylcyclohex-1-enes (14 and 15), in the same ratio (87 : 4 : 9), indicating that the respective reactions involved a common intermediate (16). Moreover, the reduction of the cis-isomer 1 with an axial methoxy group proceeded much more rapidly than that of the trans-isomer 2 with an equatorial methoxy.
本论文描述了有权立体异构体烯丙基醚 1 和 2 的合成和在乙胺中用锂还原的过程。这两种异构体的反应都很容易发生,同时甲氧基也会裂解,并以相同的比例(87 : 4 : 9)得到相同的产物,即 4-叔丁基-1-甲基环己烯(13)以及 c-和 t-3-叔丁基-6-甲基环己烯(14 和 15),这表明各自的反应涉及到一个共同的中间体(16)。此外,带有轴向甲氧基的顺式异构体 1 的还原速度比带有赤道甲氧基的反式异构体 2 快得多。