First Bovine Serum Albumin-Promoted Synthesis of Enones, Cinnamic Acids and Coumarins in Ionic Liquid: An Insight into the Role of Protein Impurities in Porcine Pancreas Lipase for Olefinic Bond Formation
作者:Nandini Sharma、Upendra K. Sharma、Rajesh Kumar、Nidhi Katoch、Rakesh Kumar、Arun K. Sinha
DOI:10.1002/adsc.201000870
日期:2011.4.18
bromide (BSA‐[bmim]Br) has been developed for the synthesis of (E)‐α,β‐unsaturated compounds including a one‐pot cascade synthesis of cinnamic acids and coumarins via aldol, Knoevenagel and Knoevenagel–Doebnercondensations.
Regioselectivity of Birch Reductive Alkylation of Biaryls
作者:Raphaël Lebeuf、Frédéric Robert、Yannick Landais
DOI:10.1021/ol051377i
日期:2005.10.1
regioselectivity of the Birchreductive alkylation of polysubstituted biaryls has been investigated. Results indicate that regioselectivity is affected by the electronic nature of substituents on both aromatic rings. The electron-rich 3,5-dimethoxyphenyl moiety is selectively reduced and then alkylated, while phenols and aniline are not dearomatized under these conditions. Biaryls possessing a phenol moiety are
Antitumor agents. 258. Syntheses and evaluation of dietary antioxidant—taxoid conjugates as novel cytotoxic agents
作者:Kyoko Nakagawa-Goto、Koji Yamada、Seikou Nakamura、Tzu-Hsuan Chen、Po-Cheng Chiang、Kenneth F. Bastow、Shao-Chun Wang、Bill Spohn、Mien-Chie Hung、Fang-Yu Lee、Fang-Chen Lee、Kuo-Hsiung Lee
DOI:10.1016/j.bmcl.2007.06.083
日期:2007.9
coumarin, were conjugated with paclitaxel (1) through an ester linkage. The newly synthesized compounds were evaluated for cytotoxic activity against several human tumorcell lines as well as the corresponding normal cell lines. Interestingly, most tested conjugatesselectively inhibited the growth of 1A9 (ovarian) and KB (nasopharyngeal) tumorcells without activity against other cell lines. Particularly
ORGANOPHOSPHORUS CHEMISTRY 32. THE REACTION OF VANILLIN, <i>ORTHO</i>-VANILLIN AND PIPERONAL WITH STABILIZED METHYLENETRIPHENYLPHOSPHORANES (WITTIG REAGENTS)
作者:Taghrid S. Hafez、Maged M. Henary、Mohamed Refat、H. Mahran
DOI:10.1080/10426509808045482
日期:1998.12.1
piperonal (3) reacted with ylidenetriphenylphosphoranes 4a-f in boiling toluene following the Wittig mechanism to give the ethylenes 5a-f and 7a-f. Similarly, ethylenes 8c-f were produced when orrho-vanillin (2) was allowed to react with 4c-f. The reaction of aldehyde (2) with the P-ylides 4a,b yielded the Wittig products 8a,b and 8-methoxycoumarin (10). Triphenylphosphine oxide (TPPO, 6) was isolated
Oxabenzomorphane: Synthese, Reaktionen und ZNS-Wirkung von 2,6-Methano-1-benzoxocinen
作者:Fritz Eiden、Peter Gmeiner
DOI:10.1002/ardp.19873200306
日期:——
Die basisch katalysierte Umsetzung von Salicylidenaceton (3a) mit Acetessigester (2a) führt zum Tetrahydro‐methanobenzoxocinon 4a. Mit Derivaten der Ausgangsprodukte (3b‐f und 2b‐f) entstehen die Tricyclen 4b‐g bzw. 8a‐d, daneben können die Cyclohexenone 7a‐f isoliert werden sowie die Oxaphenanthrene 9 bzw. 10a‐d. Die Amine 12a‐d, durch reduktive Aminierung von 4a dargestellt, wirken im Tierversuch
Die basicch katalysierte Umsetzung von Salicylidenaceton (3a) mit Acetessigester (2a) führt zum Tetrahydro-methanobenzoxocinon 4a。Mit Derivaten der Ausgangsprodukte (3b-f und 2b-f) entstehen die Tricyclen 4b-g bzw。8a-d, daneben können die Cyclohexenone 7a-f isoliert werden sowie die Oxaphenanthrene 9 bzw。10a-d。Die Amine 12a-d, durch reduktive Aminierung von 4a dargestellt, wirken im Tierversuch erregend