Catalytic asymmetric synthesis of various isoxazoline-N-oxides having a tetrasubstituted carbon has been accomplished by asymmetric phase-transfer conjugate addition of bromomalonate to nitroolefins and subsequent ring-closing O-alkylation. The obtained isoxazoline-N-oxide was readily converted to the corresponding oxime, isoxazoline, and lactam without loss of optical purity.
                                    通过
溴代
丙二酸酯与硝基烯烃的不对称相转移共轭加成以及随后的闭环O-烷基化,完成了各种具有四取代碳的
异恶唑啉-N-氧化物的催化不对称合成。所得
异恶唑啉-N-氧化物很容易转化为相应的
肟、
异恶唑啉和内酰胺,且不损失光学纯度。