The chemistry of zerumbone. Part 5: Structural transformation of the dimethylamine derivatives
作者:Takashi Kitayama、Taketo Yokoi、Yasushi Kawai、Richard K Hill、Masanori Morita、Tadashi Okamoto、Yukio Yamamoto、Valery V Fokin、K.Barry Sharpless、Seiji Sawada
DOI:10.1016/s0040-4020(03)00667-7
日期:2003.6
Zerumbone (1) and its 6,7-epoxide (2) react with ammonia and dimethylamine regio- and stereospecifically, affording monoamines 3, 4, 7 and 8. All adducts have the same relative configuration at C2 and C3. The conjugate amination is thermodynamically controlled to arrive at a single diastereomer. At 15°C 7 reacts with cyanide to give aminonitrile 10 as the single product, while at 30°C, acyclic aminonitrile
球姜酮(1)和它的6,7-环氧化物(2)与氨反应和二甲胺区域选择性和立体有择性,得到一元胺3,4,7和8。所有加合物在C2和C3处具有相同的相对构型。热力学控制共轭胺,以达到单个非对映异构体。在15℃下,7与氰化物反应得到氨基腈10,为单一产物,而在30℃下,也形成无环氨基腈11。与8的反应在0°C时提供双环氨基腈12在30℃或更高的温度下,获得了十二烷骨架的混合物,获得了12与三环腈13和13 '的混合物。的回流7,8和10在乙腈水溶液中促进通过后曼尼希反应的球姜酮环,以提供无环醛的断裂16 - 18分别。的二甲基氨基7,8和10是由Cope-和碱催化立体有择地抵销消除再生球姜酮骨架中的产品1,2和21。应付12的消除反应是通过脱氨基环过环醚化反应生成13和13 '的混合物。