Lapyryse de l'adduit (A) du chlorure de l'acidevinyl-3 norbornene-5carboxylique-2 et du methoxycarbonyl-1methyl-2 phenylthio-1'ethyliminomethyl-3 indole donne un produit retro-Diels-Alder (B) , l'六氢甲氧基羰基-7苯硫基-2'乙基-1吡啶并[3,2-c]咔唑酮-2;A et B sont convertis separement en methoxycarbonyl-1 tetrahydro-2,3,6,7 phenylthio-11p desethyl-20 aspidospermidinone-8
Lapyryse de l'adduit (A) du chlorure de l'acidevinyl-3 norbornene-5carboxylique-2 et du methoxycarbonyl-1methyl-2 phenylthio-1'ethyliminomethyl-3 indole donne un produit retro-Diels-Alder (B) , l'六氢甲氧基羰基-7苯硫基-2'乙基-1吡啶并[3,2-c]咔唑酮-2;A et B sont convertis separement en methoxycarbonyl-1 tetrahydro-2,3,6,7 phenylthio-11p desethyl-20 aspidospermidinone-8
Exploiting the Distal Reactivity of Indolyl Methylenemalononitriles: An Asymmetric Organocatalyzed [4+2] Cycloaddition with Enals Enables the Assembly of Elusive Dihydrocarbazoles
generation of indolyl ortho‐quinodimethanes from 2‐methylindole‐based methylenemalononitriles by amine‐mediated remote C(sp3)−H deprotonation was developed. These intermediates were efficiently trapped by diverse enals to provide a rapid entry to 2,9‐dihydro‐1H‐carbazole‐3‐carboxyaldehyde structures through a formal asymmetric [4+2] eliminative cycloaddition governed by a α,α‐diphenylprolinol trimethylsilyl