Catalytic Asymmetric Cycloaddition Reaction of Alkenyl Trichloroacetates with Nitrones
作者:Akira Yanagisawa、Atsuto Izumiseki、Takuya Sugita、Naoyuki Kushihara、Kazuhiro Yoshida
DOI:10.1055/s-0031-1290094
日期:2012.1
(S)-BINOL-derived chiral tin dibromide possessing a 4-trifluoromethylphenyl group at 3- and 3′-positions as the chiral precatalyst in the presence of sodium ethoxide, sodium iodide, and ethanol. Optically active isoxazolidines with up to 95% ee were diastereoselectively obtained in high yields even from aliphatic aldehyde derived nitrones under the influence of the in situ generated chiral tin ethoxide iodide
使用(S)-BINOL衍生的在3和3'-位具有4-三氟甲基苯基的手性二溴化锡作为手性预催化剂,在乙醇钠,乙醇钠存在下,实现了三氯乙酸烯基与硝酮的催化对映选择性环加成反应。碘化物和乙醇。在原位产生的手性乙氧基锡碘化物的影响下,即使从脂肪醛衍生的硝基也可以高收率选择性地非对映选择性地获得具有高达ee达95%的光学活性异恶唑烷。 不对称催化-环加成-异恶唑烷-硝酮-锡