نتایج جستجو برای: acetates
تعداد نتایج: 894 فیلتر نتایج به سال:
Glabrin (2-Piperidine, carboxylic acid, 4, 5, dihydroxy, -1-methyl) was isolated from Pongamia glabra seeds and metal complexes were prepared by refluxing with acetates of cupper, zinc and mercury, estimation was carried out by simple idometric method for copper complex and E.D.T.A. method for zinc and mercury complexes of glabrin. Results of present study reveal that the metal complexes show c...
Trap captures of male larch casebearer moths C. laricella (H b.) in response to the primary female pheromone (Z)-5d ecen -l-o l strongly decreased on addition of either the cor responding acetate analogue (a previously reported in hibitor) or the longer-chain homologue (Z)-5-dodeeen-lol. Various other m onoenic acetates or alcohols tested did not affect captures. Comparison with results on ot...
We describe highly enantioselective synthesis of -amino acid derivatives (1a-c) using asymmetric hydrogenation of -aminomethylacrylates (2a-c), which contain a free basic NOH group, as the key step. The -aminomethylacrylates (2a-c) were prepared using the Baylis– Hillman reaction of an appropriate aldehyde with methyl acrylate followed by acetylation of the resulting allylic alcohols (4a-b) and...
Tri-isopropylsilyl thio-glycosides (TIPS S-glycosides) were synthesized through base promoted SN2 substitution of glycosyl halides with TIPS-SH or by Lewis acid promoted glycosylation of TIPS-SH with glycosyl acetates or p-methoxyphenyl glycosides. Various thioglycoside derivatives were obtained in high yields by one-pot fluoride-mediated de-silylation and thiol alkylation with alkyl halides or...
An improved Helferich method is presented. It involves the glycosylation of 4-methyl-umbelliferone with glycosyl acetates in the presence of boron trifluoride etherate combined with triethylamine, pyridine, or 4-dimethylaminopyridine under mild conditions, followed by deprotection to give fluorogenic 4-methylumbelliferyl glycoside substrates. Due to the use of base, the glycosylation reaction p...
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