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Showing posts with label Lewis Acid Catalyst. Show all posts
Showing posts with label Lewis Acid Catalyst. Show all posts
Monday, November 20, 2017
Friday, January 15, 2016
One-Pot Sequential Propargylation/Cycloisomerization: A Facile [4+2]-Benzannulation Approach to Carbazoles
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| DOI: 10.1002/chem.201503496 |
Monday, August 17, 2015
Monday, December 1, 2014
Friday, November 15, 2013
Tuesday, October 8, 2013
Thursday, August 16, 2012
Wednesday, August 15, 2012
Wednesday, May 30, 2012
Monday, March 26, 2012
Tuesday, February 28, 2012
Practical synthesis of aromatic nitriles via gallium-catalysed electrophilic cyanation of aromatic C–H bonds
Chem. Commun., 2012, 48, 3127-3129
Thursday, February 2, 2012
Oxidative Prins and Prins/Friedel–Crafts cyclizations for the stereoselective synthesis of dioxabicycles and hexahydro-1H-benzo[f]isochromenes via the benzylic C–H activation
1-Benzyl ethers of (E)- and (Z)-hex-3-en-1,6-diols and hept-3-en-1,7-diols undergo a smooth oxidative cyclization with DDQ in the presence of In(OTf)3 through a sequential C–H bond activation and an intramolecular Prins cyclization to afford the corresponding trans- and cis-fused hexahydro-2H-furo[3,2-c]pyrans and octahydropyrano[4,3-b]pyrans respectively in good yields with an excellent stereoselectivity. Aryl tethered homoallylbenzyl ethers such as benzyl ethers of (E)- and (Z)-6-arylhex-3-enyl alcohols undergo a tandem Prins/Friedel–Crafts cyclization in the presence of stoichiometric amounts of DDQ and SnCl4via the benzylic C–H bond activation to furnish the corresponding trans- and cis-fused hexahydro-1H-benzo[f]isochromenes in good yields with complete stereoselectivity.
Friday, December 23, 2011
Tuesday, December 6, 2011
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