Annulation of β-aryl-α-nitro-α,β-enals and 2,2-dimethyl-1,3-dioxan-5-one: a one-step assembly of nitrocyclitols. Application to a short practical synthesis of (±)-7-deoxy-2-epi-pancratistatin tetraacetate
A Cascade Annulation Based Convergent Approach to Racemic Tetrodotoxin
作者:Fernando Cagide-Fagín、Ricardo Alonso
DOI:10.1002/ejoc.201001159
日期:2010.12
synthetic power of the recently developed cascade annulations of β-(hetero)aryl-α-nitro-α,β-enals with the pyrrolidine-derived enamine of 2,2-dimethyl-1,3-dioxan-5-one is demonstrated by the first convergent route to (±)-tetrodotoxin.
Enantioselective Synthesis of Protected Nitrocyclohexitols with Five Stereocenters. Total Synthesis of (+)-Pancratistatin
作者:Fernando Cagide-Fagín、Olaia Nieto-García、Hugo Lago-Santomé、Ricardo Alonso
DOI:10.1021/jo3022567
日期:2012.12.21
2-dimethyl-1,3-dioxan-5-one, a procedure that renders highly oxygenated nitrocyclohexanes endowed with five new stereocenters. Use of this reaction allowed the development of a totalsynthesis of the antitumoral natural product (+)-pancratistatin; it also converted our previous racemic route to tetrodotoxin into an enantioselective one.
SYNTHESIS OF POLYOXYGENATED NITROGEN SYSTEMS, COMPRISING REACTIONS BETWEEN ENAMINES OF 1,3-DIOXAN-5-ONES AND NITROOLEFINS
申请人:UNIVERSIDADE DE SANTIAGO DE COMPOSTELA
公开号:EP1783123B1
公开(公告)日:2010-03-17
β-Aryl-α-nitro-α,β-enals as Heterodienes and Dienophiles
作者:Hugo Lago-Santomé、Patricia Martínez-Bescos、Marta Fernández-González、Lidia Ozores-Viturro、Fernando Cagide-Fagín、Ricardo Alonso
DOI:10.1021/jo501418u
日期:2014.9.19
As demonstrated with the beta-(2-furyl)-substituted analogue 1b, beta-aryl-alpha-nitro-alpha,beta-enals (1) behave as heterodienes against enamines and enol ethers using their enal unit (e.g., 1b -> 12). alpha-Nitro-alpha,beta-enals can act as well as highly reactive dienophiles to render adducts endowed with nitrogenated quaternary centers (e.g., 1b -> 15a). A hetero-Diels-Alder (HDA)/Diels-Alder (DA) sequence from 1b also proved feasible on serial treatment with ethyl vinyl ether and Danishefsky's diene (1b -> 14).
Chemoenzymatic Synthesis of Advanced Intermediates for Formal Total Syntheses of Tetrodotoxin
作者:Daler Baidilov、Lukas Rycek、John F. Trant、Jordan Froese、Brennan Murphy、Tomas Hudlicky
DOI:10.1002/anie.201804602
日期:2018.8.20
Advanced intermediates for the syntheses of tetrodotoxin reported by the groups of Fukuyama, Alonso, and Sato were prepared. Key steps include the toluene dioxygenase mediated dihydroxylation of either iodobenzene or benzyl acetate. The resulting diene diols were transformed into Fukuyama's intermediate in six steps, into Alonso's intermediate in nine steps, and into Sato's intermediate in ten steps