CeO2/ZrO2 as green catalyst for one-pot synthesis of new pyrano[2,3-c]-pyrazoles
作者:Surya Narayana Maddila、Suresh Maddila、Werner E. van Zyl、Sreekantha B. Jonnalagadda
DOI:10.1007/s11164-017-2878-7
日期:2017.8
via four-component reaction of malononitrile, hydrazine hydrate, ethyl acetoacetate, and substituted aldehydes is described. The catalytic material CeO2/ZrO2 was prepared and characterized by different techniques including powder X-ray diffraction (P-XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer–Emmett–Teller (BET) analysis. Twelve new pyrano[2,3-c]-pyrazole
MIL-53(Fe) Metal-Organic Frameworks (MOFs) as an Efficient and Reusable Catalyst for the One-Pot Four-Component Synthesis of Pyrano[2,3-c]-pyrazoles
作者:Mohammad Ali Ghasemzadeh、Boshra Mirhosseini-Eshkevari、Mohammad Hossein Abdollahi-Basir
DOI:10.1002/aoc.4679
日期:2019.1
A novel and simpleapproach for the efficient and rapid synthesis of pyrano[2,3‐c]‐pyrazoleshas been accomplished via the four‐component condensation reaction of malononitrile, hydrazine hydrate, ethyl acetoacetate, and substituted aldehydes using MIL‐53(Fe) metal–organic framework (MOF) as a catalyst in ethanol at room temperature. Recycling studies have shown that the MIL‐53(Fe) can be readily recovered
REPORTER SYSTEM FOR HIGH THROUGHPUT SCREENING OF COMPOUNDS AND USES THEREOF
申请人:RATAN Rajiv
公开号:US20130005666A1
公开(公告)日:2013-01-03
The NF-E2-related factor 2 (Nrf2) is a key transcriptional regulator of antioxidant defense and detoxification. To directly monitor stabilization of Nrf2 we fused its Neh2 domain, responsible for the interaction with its nucleocytoplasmic regulator, Keap1, to firefly luciferase (Neh2-luciferase). It is shown herein that Neh2 domain is sufficient for recognition, ubiquitination and proteasomal degradation of Neh2-luciferase fusion protein. The novel Neh2-luc reporter system allows direct monitoring of the adaptive response to redox stress and classification of drugs based on the time-course of reporter activation. The novel reporter was used to screen a library of compounds to identify activators of Nrf2. The most robust and yet non toxic Nrf2 activators found—nordihydroguaiaretic acid, fisetin, and gedunin-induced astrocyte-dependent neuroprotection from oxidative stress via an Nrf2-dependent mechanism.
US9200046B2
申请人:——
公开号:US9200046B2
公开(公告)日:2015-12-01
Green synthesis of novel pyrano[2,3-c]pyrazole-5-carbonitrile analogues by using Fe5(PW10V2O40)3 nanocatalyst through a one-pot Knoevenagel condensation and Michael addition mechanism
作者:Chittala V. Subrahmanyam、Battula Sreenivasa Rao、Pamerla Muralidhar、Lakinani Vaikunta Rao、Bhekumuzi Gumbi、Suresh Maddila
DOI:10.1016/j.inoche.2023.111906
日期:2024.1
A swift and green one-pot method was improved for the preparation of new pyranopyrazole analogues using iron-doped heteropoly acid [(Fe(PWVO)] (FePWV) as an efficient catalyst at room temperature and ethanol as the solvent. The one-pot, multi-component reaction combining substituted aldehyde, malononitrile,ethyl acetoacetate, and hydrazine hydrate produces remarkable yields (varying from 88 % to 98