Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 42 , Issue 2
Showing 1-34 articles out of 34 articles from the selected issue
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  • Miguel Yus, Isidro M. Pastor
    2013 Volume 42 Issue 2 Pages 94-108
    Published: February 05, 2013
    Released: February 02, 2013
    JOURNALS FREE ACCESS
    The use of carbene ligands for transition-metal complexes has been developed in the last decades, being of special interest those carbenes derived from a nitrogen-containing heterocyclic system. An interesting variety of carbene–metal complexes has been tested in the Mizoroki–Heck reaction. In comparison, few examples can be found for the Matsuda–Heck version of this coupling reaction. Additionally, the Sonogashira coupling has been also catalyzed with different carbene–metal catalysts.
    The use of carbene ligands for transition-metal complexes has been developed in the last decades, being of special interest those carbenes derived from a nitrogen-containing heterocyclic system. An interesting variety of carbene–metal complexes has been tested in the Mizoroki–Heck reaction. In comparison, few examples can be found for the Matsuda–Heck version of this coupling reaction. Additionally, the Sonogashira coupling has been also catalyzed with different carbene–metal catalysts. Fullsize Image
     
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  • Kazuya Nushiro, Satoshi Kikuchi, Tohru Yamada
    2013 Volume 42 Issue 2 Pages 165-167
    Published: February 05, 2013
    Released: February 02, 2013
    JOURNALS OPEN ACCESS
    It was found that microwave irradiation under strictly controlled temperature conditions drastically enhanced the catalytic atropo-enantioselective Corey–Bakshi–Shibata (CBS) reduction of biaryl lactones. Since the high enantioselectivity was maintained completely compared with conventional heating conditions, the present enhancement is not caused by simple microwave heating. It was also revealed that the microwave irradiation could accelerate the racemization of the atropo-enantiomers of optically active biaryl lactone. It could be concluded that the drastic enhancement with retention of the high enantioselectivity was caused not by simple heating, but by some direct microwave effect on the substrate molecule.
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