Total Syntheses of Pleiocarpamine, Normavacurine, and C-Mavacurine
摘要:
The total syntheses of C-mavacurine-type indole alkaloids, (+/-)-pleiocarpamine, (+/-)-normavacurine, and (+/-)-C-mavacurine, were accomplished. The key step in the syntheses was the cyclization between the metal carbenoid at C-16 and the N-1 position in a Corynanthe-type compound that was equipped with a diazo function. For this cyclization, the N-4 modification of the substrate using an amine-borane complex was indispensable to fix the molecular conformation.
Collective Total Synthesis of Mavacuran Alkaloids through Intermolecular 1,4‐Addition of an Organolithium Reagent.
作者:Audrey Mauger、Maxime Jarret、Aurélien Tap、Rémi Perrin、Régis Guillot、Cyrille Kouklovsky、Vincent Gandon、Guillaume Vincent
DOI:10.1002/anie.202302461
日期:——
Intermolecular 1,4-addition of a functionalized vinyl lithium reagent to a readily accessible Michael acceptor enabled the synthesis of six mavacuran alkaloids with a highly strained pentacyclic cagelike framework. The chemo- and diastereoselectivity of the reaction were rationalized by DFT calculations. Dihydroxylation and pinacol rearrangement of the indole nucleus completed the first total syntheses
The total syntheses of C-mavacurine-type indole alkaloids, (+/-)-pleiocarpamine, (+/-)-normavacurine, and (+/-)-C-mavacurine, were accomplished. The key step in the syntheses was the cyclization between the metal carbenoid at C-16 and the N-1 position in a Corynanthe-type compound that was equipped with a diazo function. For this cyclization, the N-4 modification of the substrate using an amine-borane complex was indispensable to fix the molecular conformation.