Diastereoselective Radical Hydrogenation of α-(1-Hydroxyalkyl)vinyl Sulfoxides and Sulfones Controlled by Intramolecular Hydrogen Bonding
作者:Nobuyuki Mase、Yoshihiko Watanabe、Takeshi Toru、Terumitsu Kakumoto、Tsuneo Hagiwara
DOI:10.1021/jo005525o
日期:2000.10.1
(S)-alpha-(1-hydroxyalkyl)vinyl sulfoxides (S)-5 with alkyl radicals and tributyltin hydride gave the addition-hydrogenation products with high diastereoselectivity, whereas the reaction with (R)-alpha-(1-hydroxyalkyl)vinyl sulfoxides (R)-5 resulted in complete recovery of the starting sulfoxides. Stereoselective intramolecular hydrogen bonding between the hydroxy group and the diastereotopic sulfonyl oxygen led to high
(S)-α-(1-羟烷基)乙烯基亚砜(S)-5与烷基和氢化三丁基锡的反应可得到高非对映选择性的加成氢化产物,而与(R)-α-(1-羟烷基)乙烯基亚砜(R)-5导致原料亚砜的完全回收。羟基和非对映体磺酰氧之间的立体选择性分子内氢键导致α-(1-羟乙基)乙烯基砜12自由基反应中的高非对映选择性。分子内氢键对非对映选择性以及对烷基的反应性具有重要作用。讨论了部首。