Facile and rapid entry to functionalized and optically active pyrans from tartaric acid by way of 6,8-dioxabicyclo[3.2.1]octanes. Application to the synthesis of (-)-(6S,1'S)-pestalotin

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• Chongqing maohuan Chemicals Co., Ltd

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• Zhejiang Rongkai Chemical Technology Co.,Ltd.

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• Anhui Biochem United Pharmaceutical Co., Ltd.

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• JADECHEM NINGBO CO.,LTD.

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• Changzhou LanXu Chemical Co.,ltd.(expird)

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