The Reaction Mechanism of Spirocylization and Stereoselectivity Studies for the Calyculin C<sub>16</sub>
-C<sub>25</sub>
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作者:Vesa Rauhala、Kalle Nättinen、Kari Rissanen、Ari M. P. Koskinen
DOI:10.1002/ejoc.200500206
日期:2005.10
hetero-Michael addition, a key reaction in the planned synthesis of the natural product calyculin C, has been studied by NMR. The cyclization follows Baldwin’s rules and proceeds first through a six-membered ring closure (6-endo-dig), followed by a five-membered ring cyclization (5-exo-trig). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
双分子内杂迈克尔加成的机制是天然产物花萼 C 合成中的一个关键反应,已通过 NMR 进行了研究。环化遵循鲍德温规则,首先通过六元环闭合(6-endo-dig),然后是五元环环化(5-exo-trig)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)