Lewis acid promoted Michael addition of 2-(trimethylsilyloxy)furan to 3-[(E)-2-butenoyl]-1,3-oxazolidin-2-one (2) was examined. A 1:1 complex prepared from scandium triflate and 3,3'-bis(diethylaminomethyl)-1,1'-bi-2-naphthol 5b in situ showed excellent anti-selectivity and moderate enantioselectivity, while Cu(II)-bis(oxazolines) complex exhibited excellent enantioselectivity and moderate to good anti-selectivity.
研究了
路易斯酸促进2-(三甲基
硅氧基)
呋喃与3-[(E)-
2-丁烯酰基]-
1,3-恶唑烷-2-酮(2)的迈克尔加成。由
三氟甲磺酸钪和 3,3'-双(二乙
氨基甲基)-1,1'-双-
2-萘酚 5b 原位制备的 1:1 络合物显示出优异的反选择性和中等对映选择性,而 Cu(II)-bis(
恶唑啉)络合物表现出优异的对映选择性和中等至良好的反选择性。