Free-ZnO nanoparticles: a mild, efficient and reusable catalyst for the one-pot multicomponent synthesis of tetrahydrobenzo[b]pyran and dihydropyrimidone derivatives
作者:Subhash Banerjee、Arijit Saha
DOI:10.1039/c3nj00723e
日期:——
Free-ZnO nanoparticles have been employed as a mild, efficient and reusablecatalyst for the one-pot multicomponent synthesis of tetrahydrobenzo[b]pyrans and dihydropyrimidones in excellent yields. The ZnO NPs were recycled and reused eight times.
游离ZnO纳米颗粒已被用作温和,有效和可重复使用的催化剂,以优异的收率一锅多组分合成四氢苯并[ b ]吡喃和二氢嘧啶。ZnO NP被回收再利用八次。
An efficient green approach for the synthesis of benzothiazole‐linked pyranopyrazoles as promising pharmacological agents and docking studies
computer‐aided studies of the active compounds were also conducted. In this, selected compounds were docked into the intercalation site of DNA of the DNA−gyrase complex. From these results, the highest binding energy of −10.1 kcal/mol was for 6a against DNA−gyrase. This is the first eco‐friendly synthetic method for the preparation of benzothiazole‐pyranopyrazoles and the synthetic effort in this study may serve
Visible wavelength fluorescent calcium indicators that are (i) leakage resistant and (ii) operate near membranes
申请人:Minta Akwasi
公开号:US20050233467A1
公开(公告)日:2005-10-20
A new class of visible wavelength fluorescent calcium indicators with the BAPTA-like portion rendered zwitterionic by introduction of amine and carboxylic groups. “Fluo” compounds generally function with no extra ionized groups. The modified BAPTA moiety confers new properties while retaining ion selectivity and pH insensitivity. The dyes demonstrate reduced cell leakage and improved ability to study calcium near the cell membrane and preserve the fluorescent properties of “fluo” dyes. The modifications include (a) piperazinoacetic acid XIII for the leakage resistance (FLUO-LR), (b) dodecylpiperazine XIII for a near membrane indicator (FLUO-MOMO, FLUO-NOMO amphipathic “fluo” indicators which bind to cellular membranes and respond to calcium near the membrane), and (c) a propionic acid XII for general leakage resistance -FLUO-LOJO, FLUO-KOJO “fluo” indicators with an extra charge that enables them to resist leakage).