Cycloaddition of an enantiopure cyclic nitrone to maleate: Straightforward synthesis of the necine base (-)-hastanecine

被引:0
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作者
Goti, A
Fedi, V
Nannelli, L
DeSarlo, F
Brandi, A
机构
关键词
pyrrolizidine alkaloids; (-)-hastanecine; necine bases; Mitsunobu reaction; enantiomerically pure cyclic nitrones;
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中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A formal synthesis of the necine base (-)-hastanecine, subunit of the pyrrolizidine alkaloids hastacine and punctanecine, is reported. The key intermediate 7 is synthesized in five steps from dimesylate 11, derived from L-malic acid, in 28.3% overall yield. The correct absolute stereochemistry at C7 in the target compound is attained by means of a Mitsunobu reaction on dimesylate 11. The desired stereochemistry at the remaining stereogenic centres (C1 and C7a) derives from a highly preferential exo-anti approach in the key cycloaddition of nitrone 9 (obtained with complete regiocontrol) to dimethyl maleate.
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页码:577 / &
页数:4
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