A Concise Synthesis of (-)-Indolizidines 209D and 209B
A Concise Synthesis of (-)-Indolizidines 209D and 209B
复制标题
(-)-吲哚里西啶 209D 和 209B 的简明合成
DOI:
10.1002/cjoc.200990015
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Zhao Gang
中科院分区:
文献类型:
--
作者:
Wu Hao;Yu Menglong;Zhang Yazhu;Zhao Gang
A general stereoselective synthetic route to 5-substituted and 5,8-disubstituted indolizidine alkaloids has been developed starting from commercially available L-proline. (-)-Indolizidines 209D and 209B were efficiently synthesized in 9.8% and 14.8% overall yields in seven and five-step reactions from readily available aldehyde 3 and ketone 10, respectively. The key steps of this synthesis involve a substrate-induced asymmetric addition of ethyl lithiopropiolate to aldehyde 3 or methyl ketone 10. and a two-step one-pot hydrogenation/cyclization sequence to construct the bicyclic skeleton.
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