A new synthesis of (Ϯ)-1-deoxy-6-epi-castanospermine and (Ϯ)-1-deoxy-6,8a-di-epi-castanospermine has been developed, starting from the hetero-Diels-Alder adduct of ethyl 2-nitrosoacrylate and ethyl vinyl ether. Appropriate terminal dienes were prepared by standard manipulations, which,
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