发明授权
US07351831B2 Process for asymmetric intramolecular [3+2] cyclo-addition of hydrazones 有权
腙的不对称分子内[3 + 2]环加成方法

Process for asymmetric intramolecular [3+2] cyclo-addition of hydrazones
摘要:
An intramolecular [3+2] cycloaddition reaction of a hydrazone is carried out under a mild condition with a high stereoselectivity and yield by reacting a hydrazone derivative in the presence of an asymmetric catalyst system obtained by mixing a zirconium alkoxide represented by the following formula (I): Zr(OR)4   (I) (wherein R is a hydrocarbon group which may have a substituent) with a binaphthol derivative represented by the following formula (II): (wherein Y1 and Y2 are each identical or different and denote a hydrogen atom or a halogen atom, and at least one of Y1 and Y2 denotes a halogen atom).
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