Discrimination of diastereotopic sulfonyl oxygens by intramolecular hydrogen bonding: Stereoselective hydrogenation of α-sulfonyl radicals
作者:Nobuyuki Mase、Yoshihiko Watanabe、Takeshi Toru
DOI:10.1016/s0040-4039(99)00297-x
日期:1999.4
Stereoselective intramolecular hydrogen bonding between the hydroxy group and a stereogenic sulfonyl oxygen led to high diastereoselectivity in the radical reaction of α-(1-hydroxyethyl)vinyl sulfone with alkyl iodides and tributyltin hydride in the presence of triethylborane as a radical initiator. Intramolecular hydrogen bonding was demonstrated to play an important role in controlling the diastereoselectivity
在三乙基硼烷作为自由基引发剂的存在下,α-(1-羟乙基)乙烯基砜与烷基碘化物和氢化三丁基锡的自由基反应中,羟基与立体生成的磺酰基氧之间的立体选择性分子内氢键导致高非对映选择性。分子内氢键被证明在控制非对映选择性中起重要作用。