Synthesis of rosefuran. A new route to furans through base-catalyzed cyclization of hydroxy alkynoates and alkynones
摘要:
A new synthesis of furans involving intramolecular 1,4-addition of (Z)-6-hydroxy 4-en-2-ynoates and ynones has been developed and applied to a total synthesis of rosefuran.
Synthesis of rosefuran. A new route to furans through base-catalyzed cyclization of hydroxy alkynoates and alkynones
摘要:
A new synthesis of furans involving intramolecular 1,4-addition of (Z)-6-hydroxy 4-en-2-ynoates and ynones has been developed and applied to a total synthesis of rosefuran.
Unified Approach to Furan Natural Products via Phosphine‐Palladium Catalysis
作者:Violet Yijang Chen、Ohyun Kwon
DOI:10.1002/anie.202015232
日期:2021.4.12
the construction of tetraalkyl furans remains non‐trivial. The prevalence of alkyl groups in bioactive furan natural products, combined with the desirable bioactivities of tetraalkyl furans, calls for a general synthetic protocol for polyalkyl furans. This paper describes a Michael–Heck approach, using sequential phosphine‐palladium catalysis, for the preparation of various polyalkyl furans from readily
Synthesis of Functionalized Furans Based on a ‘[3+2] Cyclization/Bromination/Elimination’ Strategy
作者:Peter Langer、Esen Bellur
DOI:10.1055/s-2006-926301
日期:——
The bromination of 2-alkylidenetetrahydrofurans -readily available via one-pot [3+2] cyclizations - afforded 2-alkylidene-3-bromotetrahydrofurans. Elimination of hydrogen bromide and subsequent aromatization of these compounds provided a convenient approach to functionalized furans.
Regioselective Synthesis of Functionalized Furans by Cyclization of 1,3-Bis-Silyl Enol Ethers with 1-Chloro-2,2-dimethoxyethane
作者:Esen Bellur、Helmar Görls、Peter Langer
DOI:10.1002/ejoc.200400805
日期:2005.5
Cyclization of 1,3-bis-silylenolethers with 1-chloro-2,2-dimethoxyethane allowed an efficient, regio- and diastereoselective synthesis of a variety of 2-alkylidene-4-methoxytetrahydrofurans. The TFA-mediated elimination of methanol resulted in the formation of functionalizedfurans. Similarly, 2,3,3a,4,5,6-hexahydro-2,3-benzofurans were prepared and transformed into 4,5,6,7-tetrahydro-2,3-benzofurans
Efficient synthesis of functionalized furans and benzofurans based on a ‘[3+2] cyclization/oxidation’ strategy
作者:Esen Bellur、Ilia Freifeld、Peter Langer
DOI:10.1016/j.tetlet.2005.02.040
日期:2005.3
Functionalized furans and benzofurans were prepared by DDQ oxidation of 2-alkylidenetetrahydrofurans, which are readily available by one-pot cyclizations of 1,3-dicarbonyl dianions or 1,3-bis-silyl enol ethers.
Carbonylation of Alkynyl Epoxides: Synthesis of 5-Hydroxy-2,3-dienoate Esters and 2,3-Dihydrofuran-3-ol Derivatives
作者:Marcelo E. Piotti、Howard Alper
DOI:10.1021/jo971303n
日期:1997.11.1
The carbonylation of alkynyl oxiranes catalyzed by (MePh2)(4)Pd in the presence of 20 atm of carbon monoxide in methanol gives methyl 5-hydroxy-2,3-pentadienoates in good yields. When the reaction is performed on alkynyl oxiranemethanol derivatives, 4,5-dihydrofuran-3-ol derivatives are obtained stereoselectively. These products arise from the spontaneous cyclization of a dihydroxyallenyl ester intermediate.