Collective Total Synthesis of Aspidofractinine Alkaloids through the Development of a Bischler–Napieralski/Semipinacol Rearrangement Reaction

A tandem Bischler–Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine‐type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction...

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Published inAngewandte Chemie International Edition Vol. 59; no. 49; pp. 21954 - 21958
Main Authors Wang, Shuang‐Hu, Si, Rui‐Qi, Zhuang, Qing‐Bo, Guo, Xiang, Ke, Tian, Zhang, Xiao‐Ming, Zhang, Fu‐Min, Tu, Yong‐Qiang
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LanguageEnglish
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Abstract A tandem Bischler–Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine‐type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction to expeditiously construct the central bridged bicyclo[2.2.1]heptane ring system of these molecules with contiguous quaternary centers. The development of this novel strategy culminated in the collective total synthesis of four aspidofractinine alkaloids. A tandem Bischler–Napieralski reaction and semipinacol rearrangement was combined with a subsequent Mannich reaction for the expeditious construction of the bicyclo[2.2.1]heptanone motif of four aspidofractinine alkaloids (see scheme). The strategy further highlights the synthetic potential of tandem semipinacol rearrangement reactions in assembling spirocyclic ring systems with a congested chemical environment.
AbstractList A tandem Bischler-Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine-type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction to expeditiously construct the central bridged bicyclo[2.2.1]heptane ring system of these molecules with contiguous quaternary centers. The development of this novel strategy culminated in the collective total synthesis of four aspidofractinine alkaloids.A tandem Bischler-Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine-type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction to expeditiously construct the central bridged bicyclo[2.2.1]heptane ring system of these molecules with contiguous quaternary centers. The development of this novel strategy culminated in the collective total synthesis of four aspidofractinine alkaloids.
A tandem Bischler–Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine‐type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction to expeditiously construct the central bridged bicyclo[2.2.1]heptane ring system of these molecules with contiguous quaternary centers. The development of this novel strategy culminated in the collective total synthesis of four aspidofractinine alkaloids. A tandem Bischler–Napieralski reaction and semipinacol rearrangement was combined with a subsequent Mannich reaction for the expeditious construction of the bicyclo[2.2.1]heptanone motif of four aspidofractinine alkaloids (see scheme). The strategy further highlights the synthetic potential of tandem semipinacol rearrangement reactions in assembling spirocyclic ring systems with a congested chemical environment.
A tandem Bischler–Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a privileged structural unit of aspidofractinine‐type monoterpenoid indole alkaloids, and was used in combination with a subsequent Mannich reaction to expeditiously construct the central bridged bicyclo[2.2.1]heptane ring system of these molecules with contiguous quaternary centers. The development of this novel strategy culminated in the collective total synthesis of four aspidofractinine alkaloids.
Author Wang, Shuang‐Hu
Tu, Yong‐Qiang
Zhang, Xiao‐Ming
Zhuang, Qing‐Bo
Guo, Xiang
Zhang, Fu‐Min
Ke, Tian
Si, Rui‐Qi
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Issue 49
Keywords MONOTERPENOID INDOLE ALKALOIDS
ACID
domino reactions
alkaloids
semipinacol rearrangement
total synthesis
FACILE
Bischler-Napieralski reaction
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Snippet A tandem Bischler–Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a...
A tandem Bischler-Napieralski/semipinacol rearrangement reaction has been developed for the purpose of assembling a bis(spirocyclic) indole framework, a...
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SubjectTerms Alkaloids
Bischler–Napieralski reaction
Chemistry
Chemistry, Multidisciplinary
domino reactions
Heptanes
Indoles
Physical Sciences
Science & Technology
semipinacol rearrangement
Synthesis
total synthesis
Title Collective Total Synthesis of Aspidofractinine Alkaloids through the Development of a Bischler–Napieralski/Semipinacol Rearrangement Reaction
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fanie.202009238
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https://www.ncbi.nlm.nih.gov/pubmed/32851781
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Volume 59
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