AbstractA one‐pot, two‐step catalytic protocol for the preparation of cinnamyl ethers from simple and readily available aryl halides, phenols and allyl chloride is reported for the first time. This simple and highly efficient palladium nanoparticles catalytic system shows good regio‐ and stereoselectivities and affords the desired products in good to high yields (49–85%) from aryl iodides. Furthermore, less reactive aryl bromides can also give the cinnamyl ethers in moderate yields (24–72%).magnified image
Pd-Catalyzed desulfitative arylation of olefins by <i>N</i>-methoxysulfonamide
作者:Subhadra Ojha、Niranjan Panda
DOI:10.1039/d1ob02360h
日期:——
A novel Pd-catalyzed protocol for the desulfitative Heck-type reaction of N-methoxy aryl sulfonamides with alkenes was reported. The cross-coupling reaction was performed successfully with a variety of olefins to obtain aryl alkenes. Different substituents on the aromatic ring of N-methoxysulfonamides were also found to be compatible with the reaction conditions. Expectedly, the reaction proceeds through
Catalytic Enantioselective Aziridoarylation of Aryl Cinnamyl Ethers toward Synthesis of <i>trans-</i>3-Amino-4-arylchromans
作者:Saumen Hajra、Debarshi Sinha
DOI:10.1021/jo200711s
日期:2011.9.16
found to be very efficient for asymmetric aziridination followed by intramoleculararylation (Friedel–Crafts) reaction to provide a general and direct method for the synthesis of trans-3-amino-4-arylchromans with high regio-, diastereo- (dr > 99:1), and enantioselectivity (up to 95% ee) with moderate yield. trans-3-Amino-4-arylchroman is an advanced intermediate for the synthesis of chromenoisoquinoline
Selective Synthesis of
<i>Z</i>
‐Cinnamyl Ethers and Cinnamyl Alcohols through Visible Light‐Promoted Photocatalytic
<i>E</i>
to
<i>Z</i>
Isomerization
A photocatalytic E to Z isomerization of alkenes using an iridium photosensitizer under mild reaction conditions is disclosed. This method provides scalable and efficient access to Z-cinnamyl ether and allylic alcohol derivatives in high yields with excellent stereoselectivity. Importantly, this method also provides a powerful strategy for the selective synthesis of Z-magnolol and honokiol derivatives
Palladium-catalyzed Mizoroki–Heck reaction of allyl aryl ethers with aryliodides gave aryl cinnamyl ethers using a catalytic amount of Pd(OAc)2 in DMF at 50 °C with phosphine-free hydrazone as a ligand in good yields.