Ethyl glyoxylate O-tert-butyldimethylsilyloxime, on treatment with various alkenes in the presence of BF3·OEt2, generated a C-ethoxycarbonyl N-boranonitrone intermediate, which underwent intermolecular cycloaddition to afford 3-(ethoxycarbonyl)isoxazolidines in moderate to high yields.
在
BF3·OEt2存在下,
乙二醛酸O-叔丁基二甲基
硅氧基
苯胺与各种烯烃反应,生成C-乙氧羰基N-
硼烷腈中间体,该中间体经过分子间环加成反应,以中等至高产率得到3-(乙氧羰基)
异恶唑烷酮。