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US6096883A 3-hydroxy gamma-lactone based enantioselective synthesis of azetidinones 有权
基于3-羟基γ-内酯的对映选择性合成氮杂环丁酮

3-hydroxy gamma-lactone based enantioselective synthesis of azetidinones
摘要:
The invention relates to intermediates of the formulae ##STR1## said intermediates being useful in a process for producing a compound of the formula ##STR2## wherein Bn is benzyl and R.sub.1, .sub.2 and R.sub.3 are as defined in the specification,
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