Nuclear analogues of β lactam antibiotics. 1. The total synthesis of a 7 oxo 1,3 diazabicyclo[3.2.0]heptane 2 carboxylic acid via a versatile monocyclic β lactam intermediate

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• Zhejiang Quzhou Jiancheng Silicone Co., Ltd.(Shanghai Jiancheng Industial and Trade Co, Ltd)

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• Tianjin Emulsion Science&Technology Development Co.,Ltd

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• Shanghai Yuking Water Soluble Material Tech Co., Ltd

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• shanghai hekang chemical co.ltd

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