A General and Facile Synthesis of Substituted Furans by Palladium-Catalyzed Cycloisomerization of (Z)-2-En-4-yn-1-ols
摘要:
A general and facile synthesis of furans, based on Pd(II)-catalyzed cycloisomerization of (Z)-2-en-4-yn-1-ols, is described. Cycloisomerization reactions are carried out at 25-100 degrees C in the presence of a very simple catalytic system, consisting of K2PdI4, under essentially neutral conditions. This new methodology is very versatile and can be applied to the synthesis of a variety of substituted furans, including particularly fragile, naturally occurring furans such as rosefuran. Efficient synthetic approaches for the regioselective synthesis of suitably substituted (Z)-2-en-4-yn-1-ols have been developed.
A new and efficient synthesis of rosefuran. A general synthesis of furans by palladium-catalysed cycloisomerization of (Z)-2-en-4-yn-1-ols
作者:Bartolo Gabriele、Giuseppe Salerno
DOI:10.1039/a701988b
日期:——
(Z)-3,7-Dimethylocta-2,6-dien-4-yn-1-ol, readily available
from (Z)-3-methylpent-2-en-4-yn-1-ol, undergoes
cycloisomerization in the presence of catalytic amounts of
K
2
PdI
4
to give rosefuran in high yield.
Iridium(I)-Catalyzed Coupling of (Z)-2-En-4-yn-1-ols with Activated Alkynes: A New Synthetic Route to 7-Oxanorbornadienes
作者:Alba E. Díaz-Álvarez、Pascale Crochet、Victorio Cadierno
DOI:10.1002/adsc.201000408
日期:2010.10.4
Taking advantage of the ability shown by the iridium(I) dimer [Ir(μ-Cl)(COD)}2] to promote the cycloisomerization of (Z)-enynols into furans, an unprecedented syntheticroute to 7-oxanorbornadienes has been developed just by performing the catalytic reactions in the presence of activatedalkynes. The process, which proceeds under solvent-free conditions, furnishes the bicyclic alkenes in good yields
A general and regioselective synthesis of substituted pyrroles 2 by cycloisomerization of readily available (Z)-(2-en-4-ynyl)amines 1 is reported. Spontaneous cycloisomerization leading to 2 occurred in the course of preparation of enynamines bearing a terminal triple bond or a triple bond substituted with a phenyl or a CH2OTHP group. When the triple bond was substituted with an alkyl or alkenyl group
Rapid Synthesis of Taxifolione and Taxifolial D, Two Metabolites from the Marine Alga Caulerpa taxifolia
作者:Fabien Fecourt、Cedric Carlier、Patrick Pale
DOI:10.2174/157017809787003179
日期:2009.1.1
The synthesis of two natural products - Taxifolione and Taxifolial D – isolated from the marine alga Caulerpa taxifolia invading the Mediterranean Sea was performed. Coupling reactions allowed for a rapid synthesis. The surprising Z configuration of Taxifolial D was confirmed after synthesis and comparison of each synthetic stereoisomer.
我们合成了从入侵地中海的海洋藻类 Caulerpa taxifolia 中分离出来的两种天然产品--Taxifolione 和 Taxifolial D。耦合反应实现了快速合成。经过合成和比较每种合成立体异构体,证实了 Taxifolial D 令人惊讶的 Z 构型。
Synthesis of rosefuran. A new route to furans through base-catalyzed cyclization of hydroxy alkynoates and alkynones
作者:James A. Marshall、William J. DuBay
DOI:10.1021/jo00066a003
日期:1993.7
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.