Chinese Journal of Organic Chemistry >
Received date: 2023-04-25
Revised date: 2023-05-19
Online published: 2023-05-25
Supported by
Department of Education of Guangdong Province(2021KCXTD044)
Tetrahydroprotoberberine alkaloids have good bioactivity against malaria and epilepsy, among them, xylopinine has good anti malaria activity, while laudanosine has epilepsy treatment activity. A concise asymmetric synthesis of ( S)-(–)- xylopinine and ( S)-(+)-laudanosine has been reported. The key strategies include diastereoselective nucleophilic addition to N-tert-butanesulfinimine, which is combined with Pictet-Spengler reaction as a key step for constructing the pivotal tetrahydroprotoberberine skeleton. This strategy provides a concise and rapid approach to ( S)-(–)-xylopinine (7 steps and 11.1% overall yield) and ( S)-(+)-laudanosine (7 steps and 16.4% overall yield) from known starting materials. The S configuration of synthetic xylopinine and laudanosine at C(14) is confirmed by comparing their specific rotation data.
Key words: xylopinine; laudanosine; N-tert-butanesulfinimine; asymmetric addition
Junjie Zhang , Xuetao Xu . [J]. Chinese Journal of Organic Chemistry, 2023 , 43(9) : 3297 -3303 . DOI: 10.6023/cjoc202304032
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