Abstract Three-component Mukaiyama–Mannich reaction of aldehydes, amines, and silyl enol diazoacetoacetate was efficiently carried out to afford δ-amino substituted-α-diazoacetoacetate derivatives catalyzed by 5 mol% of MgI2 etherate (MgI2•(OEt2)n) under mild and neutral reaction conditions in good to excellent yields. GRAPHICAL ABSTRACT
Acid-catalyzed oxidative cross-coupling of acridans with silyl diazoenolates and a Rh-catalyzed rearrangement: two-step synthesis of γ-(9-acridanylidene)-β-keto esters
作者:Weiyu Li、Hao Xu、Lei Zhou
DOI:10.1039/d1ob00691f
日期:——
oxidative cross-coupling of acridans and silyl diazoenolates and a Rh2(OAc)4-catalyzed rearrangement of the resultant diazo products are described. The reactions provide various γ-(9-acridanylidene)-β-keto esters in good yields, which bear an active α-methylene unit for further functionalization.
Alkynoate Synthesis through the Vinylogous Reactivity of Rhodium(II) Carbenoids
作者:Damien Valette、Yajing Lian、John P. Haydek、Kenneth I. Hardcastle、Huw M. L. Davies
DOI:10.1002/anie.201204047
日期:2012.8.20
Siloxy group migration: A rhodium(II) carbenoid approach has been developed for the synthesis of alkynoates (see scheme). This transformation combines the addition of enol ethers at the vinylogous position of β‐siloxy‐substituted vinyldiazo derivatives with a siloxy group migration to give the products as single diastereomers.
A convergent approach to batzelladine alkaloids. Total syntheses of (+)-batzelladine E, (−)-dehydrobatzelladine C, and (+)-batzelladine K
作者:Christos Economou、Justin P. Romaire、Tony Z. Scott、Brendan T. Parr、Seth B. Herzon
DOI:10.1016/j.tet.2018.04.050
日期:2018.6
We recently reported a convergent strategy to access the polycyclic guanidinium alkaloid (+)-batzelladine B via an aldol addition–retro-aldol–aza-Michael addition cascade. Here we describe the application of this approach toward the total syntheses of (+)-batzelladine E, (−)-dehydrobatzelladine C, and (+)-batzelladine K. The identification of suitable methods to functionalize a common tropane core