Synthesis and applications of tert-alkoxysiloxane linkers in solid-phase chemistry
作者:Marco M. Meloni、Peter D. White、Duncan Armour、Richard C.D. Brown
DOI:10.1016/j.tet.2006.10.052
日期:2007.1
Straightforward syntheses of two tert-alkoxysilyl chloride functionalised resins 3 and 31 that allow facile attachment of 1 degrees, 2 degrees, 3 degrees alcohols and phenols to the solid-phase have been achieved. Resin 3 displayed useful loading levels (0.7 mmol/g), and it was stable to storage in activated form. Siloxanes from reaction of 3 with alcohols and phenols were compatible with a variety of reaction conditions commonly used in solid-phase synthesis. (c) 2006 Published by Elsevier Ltd.
β‐Aryl Nitrile Construction<i>via</i>Palladium‐Catalyzed Decarboxylative Benzylation of α‐Cyano Aliphatic Carboxylate Salts
作者:Rui Shang、Zheng Huang、Xiao Xiao、Xi Lu、Yao Fu、Lei Liu
DOI:10.1002/adsc.201200383
日期:2012.9.17
The palladium‐catalyzed decarboxylative benzylation of α‐cyano aliphatic carboxylatesalts with benzyl electrophiles was discovered. This reaction exhibits good functional group compatibility and proceeds under relatively mild conditions. A diverse range of quaternary, tertiary and secondary β‐aryl nitriles can be conveniently prepared by this method.
limitations of the base-free oxidativeHeckreaction with arylboronicacids have been explored. Under our conditions, the dmphen−palladium(II)-catalyzed arylation proceeded with air or p-benzoquinone as reoxidants of palladium(0). We found that ambient temperature and mild aerobic conditions allow for the use of substrates sensitive to palladium(II)-catalyzedoxidation. OxidativeHeck couplings, employing