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March 2008
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12 Reads
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1 Citation
ChemInform
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
December 2007
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26 Reads
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39 Citations
Chemical Communications
Alkenyl triflates in combination with Co(acac)(3) as a catalyst were found to be excellent coupling partners of alkynyl Grignard reagents, where no special additives (even a phosphine ligand) but a common solvent, THF, are required to obtain variously substituted enynes.
... Compound 9 was then protected as a Bocsulfonamide by treatment with di-(tert-butyl)dicarbonate in CH 2 Cl 2 using 4- (dimethylamino)pyridine (DMAP) as acylation catalyst [22]. The N-protected intermediate 10 was submitted to the Sonogashira reaction [23,24] in the presence of Pd(II), CuI, triphenylphosphine and triethylamine to afford the acetylenic derivative 11. Acid hydrolysis with TFA allowed to deprotect the carboxylic acid and the sulfonamidic nitrogen in a single step. ...
March 2008
ChemInform
... Only triflate 11 was isolated as a solution in tetrahydrofuran (THF) (Scheme 5). The vinylation of alkynylmagnesium bromide 14 can be performed using vinyl nonaflate in the presence of a cobalt catalyst to produce enyne 15 (Scheme 6) [108]. The optimized reaction conditions have a significantly broader scope, although enyne 15 was prepared in a near-quantitative isolated yield. ...
December 2007
Chemical Communications
