New Class of Biodegradable Polymers Formed from Reactions of an Inorganic Functional Group
摘要:
Although numerous small molecules have been synthesized with sulfenamide bonds (R2N-SR), this is the first report of the synthesis of polysulfenamides. These polymers are readily synthesized at room temperature using secondary diamines and dithiosuccinimides. The dithiosuccinimides were readily synthesized in one step by the reaction of dithiols such as HS(CH2)(6)SH with N-chlorosuccinimide. The resulting dithiosuccinimides were either recrystallized or readily purified by chromatography on silica gel and required no special handling. The conversions of polymerization ranged from 95 to 98%, and the molecular weights of the polymer reached as high as 6300 g mol(-1). The sulfenamide bond was very stable in organic solvents, and no degradation was observed under atmospheric conditions in C6D6 for 30 days. In contrast, the sulfenamide bond readily decomposed in less than 12 h in D2O. Polysulfenamides were fabricated into micrometer-sized particles loaded with dye and endocytosed into JAWSII immature dendritic and HEK293 cells. Polysulfenamides represent a new class of polymers that are readily synthesized, stable in aprotic solvents, and readily degrade in water.
Enantioselective Construction of Chiral Sulfides via Catalytic Electrophilic Azidothiolation and Oxythiolation of <i>N</i>-Allyl Sulfonamides
作者:Yaoyu Liang、Xiaodan Zhao
DOI:10.1021/acscatal.9b01900
日期:2019.8.2
An efficient and convenient pathway was developed for enantioselective synthesis of chiral sulfides by chiralbifunctional selenide-catalyzed electrophilic azidothiolation and oxythiolation of N-allyl sulfonamides. By this protocol, a variety of chiral vicinal azidosulfides and oxysulfides were obtained in good yields with high enantioselectivities and diastereoselectivities. In this transformation
Catalyst-Free Isothiocyanatoalkylthiation of Styrenes with (Alkylthio)pyrrolidine-2,5-diones and Trimethylsilyl Isothiocyanate
作者:Hua Tian、Jipan Yu、Haijun Yang、Changjin Zhu、Hua Fu
DOI:10.1002/adsc.201501181
日期:2016.6.2
A simple and efficient catalyst‐free method for isothiocyanatoalkylthiation of styrenes has been developed. The protocol uses (alkylthio)pyrrolidine‐2,5‐diones and trimethylsilyl isothiocyanate as the isothiocyanatoalkylthiolating reagents, dimethylformamide (DMF) as the solvent, and the reactions were completed within one hour with tolerance of some functional groups. No catalyst and additive were
The present invention provides novel adenosine receptor antagonists, more particularly, A
1
adenosine receptor antagonists. Pharmaceutical compositions comprising an A
1
adenosine receptor antagonist disclosed herein and a pharmaceutically acceptable carrier are further provided. Compositions also include diagnostic assay-type probes comprising a novel A
1
adenosine receptor antagonist that is labeled or conjugated with radioactive or non-radioactive material. Methods for treating A
1
adenosine receptor related disorders comprising administering an A
1
adenosine receptor antagonist of the invention are also disclosed. The novel A
1
adenosine receptor antagonist compositions find further use in diagnostic and imaging methods.