Chemoselective Activation of Diethyl Phosphonates: Modular Synthesis of Biologically Relevant Phosphonylated Scaffolds
作者:Pauline Adler、Amandine Pons、Jing Li、Jörg Heider、Bogdan R. Brutiu、Nuno Maulide
DOI:10.1002/anie.201806343
日期:2018.10
Phosphonates have garnered considerable attention for years owing to both their singular biological properties and their synthetic potential. State‐of‐the‐art methods for the preparation of mixed phosphonates, phosphonamidates, phosphonothioates, and phosphinates rely on harsh and poorly selective reaction conditions. We report herein a mild method for the modular preparation of phosphonylated derivatives
The massspectra of carboalkoxyalkylphosphonates has been obtained. β-Cleavage to the phosphoryl group with a hydrogen rearrangement dominates in 3-carbethoxypropylphosphonate and 5-carbethoxyamylphosphonate, the well-known hydrogen migration to the carbonyl group being suppressed. Formation of anm/e 152 152 ion (a) in the spectra of carboalkoxyalkylphosphonates is interpreted in terms of skeletal rearrangement
Biodegradable Magnetic Nanocarrier for Stimuli Responsive Drug Release
作者:Mutyala Naidu Ganivada、Vijayakameswara Rao N、Himadri Dinda、Pawan Kumar、Jayasri Das Sarma、Raja Shunmugam
DOI:10.1021/ma500384m
日期:2014.4.22
Biocompatible nanocarriers conjugated with magnetic nanoparticle, doxorubicin and poly(ethylene oxide) (PEG) motif have been designed (PVLPEG-PVLDOXI-PCL-PHOS) to create a magnetic vector under magnetic field. Acylhydrazine linker is used to release the drug exactly at the mild acidic conditions resembling the pH of the cancerous cells. All the monomers and polymers are characterized carefully by the routine analytical techniques. Thermogravimetric analysis (TGA), FT-IR spectroscopy and scanning electron microscope (SEM) techniques are employed to confirm the anchoring of iron particle (Fe3O4) to the PVLPEG-PVLDOXI-PCL-PHOS. Reservoir capabilities of the newly designed biodegradable nanocarrier are tested by both dynamic light scattering (DLS) and transmission electron microscopy (TEM). Drug release profile from nanocarrier is monitored by fluorimeter. The release profile shows the importance of having the acylhydrazine linker that helps to release the drug at the mild acidic conditions similar to cancerous cells. Confocal laser scanning microscopy (CLSM) and flow cytometry studies on 4T cells indicate that nanocarriers from PVLPEG-PVLDOXI-PCL-PHOS polymer are internalized efficiently. It is very interesting to note that the nanocarriers have exhibited both biologically and magnetically targeting abilities toward 4T cells in vitro.
ISOXAZOLINE COMPOUNDS AS ANTIINFLAMMATORY AGENTS
申请人:PFIZER INC.
公开号:EP0730588B1
公开(公告)日:1997-07-02
ISOXAZOLINE COMPOUNDS AS INHIBITORS OF TNF RELEASE