97600-45-8Relevant articles and documents
Preparation and characterization of amphiphilic calixarene nanoparticles as delivery carriers for paclitaxel
Zhao, Zi-Ming,Wang, Yu,Han, Jin,Zhu, Hui-Dong,An, Lin
, p. 180 - 186 (2015)
Two types of amphoteric calix[n]arene carboxylic acid (CnCA) derivative, i.e., calix[6]arene hexa-carboxylic acid (C 6 HCA) and calix[8]arene octo-carboxylic acid (C 8OCA), were synthesized by introducing acetoxyls into the hydroxyls of calix[n]arene (n-6, 8). C6HCA and C8 OCA nanoparticles (NPs) were prepared successfully using the dialysis method. C nCA NPs had regular spherical shapes with an average diameter of 180-220 nm and possessed negative charges of greater than -30 mV. C6 HCA and C8OCA NPs were stable in 4.5% bovine serum albumin solutions and buffers (pH 5-9), with a low critical aggregation concentration value of 5.7 mg?L--1 and 4.0 mg?L--1, respectively. C6 HCA and C8 OCA NPs exhibited good paclitaxel (PTX) loading capacity, with drug loading contents of 7.5% and 8.3%, respectively. The overall in vitro release behavior of PTX from the CnCA NPs was sustained, and C 8 OCA NPs had a slower release rate compared with C6 HCA NPs. These favorable properties of CnCA NPs make them promising nanocarriers for tumortargeted drug delivery.
Synthesis of functional aromatic multisulfonyl chlorides and their masked precursors
Percec,Bera,De Binod,Sanai,Smith,Holerca,Barboiu,Grubbs,Frechet
, p. 2104 - 2117 (2007/10/03)
The synthesis of functional aromatic bis(sulfonyl chlorides) containing an acetophenone and two sulfonyl chloride groups, i.e., 3,5-bis[4-(chlorosulfonyl)phenyl]-1-acetophenone (16), 3,5-bis(chlorosulfonyl)-1-acetophenone (17), and 3,5-bis(4-(chlorosulfonyl)phenyloxy)-1-acetophenone (18) via a sequence of reactions, involving in the last step the quantitative oxidative chlorination of S-(aryl)-N,N′-diethylthiocarbamate, alkyl- or benzyl thiophenyl groups as masked nonreactive precursors to sulfonyl chlorides is described. A related sequence of reactions was used for the synthesis of the aromatic trisulfonyl chloride 1,1,1-tris(4-chlorosulfonylphenyl)ethane (24). 4-(Chlorosulfonyl)phenoxyacetic acid, 2,2-bis[[[4-(chlorosulfonyl)phenoxyacetyl]oxy]methyl]-1,3-propanediyl ester (27), 5,11,17,23-tetrakis(chlorosulfonyl)-25,26,27,28-tetrakis (ethoxycarbonylmethoxy)calix[4]arene (38), 5,11,17,23,29,35-hexakis(chlorosulfonyl)-37,38,39,40,41,42-hexakis (ethoxycarbonylmethoxy)calix[6]arene (39), 5,11,17,23,29,35,41,47-octakis (chlorosulfonyl)-49,50,51,52,53,54,55,56-octakis(ethoxycarbonylmethoxy) calix[8]arene (40), 5,11,17,23-tetrakis(tert-butyl)-25,26,27,28-tetrakis(chlorosulfonyl phenoxyacetoxy)calix[4]arene (44), 5,11,17,23,29,35-hexakis(tert-butyl)-37,38,39,40,41,42-hexakis (chlorosulfonylphenoxyacetoxy)calix[6]arene (45), and 5,11,17,23,29,35,41,47-octakis (tert-butyl)-49,40,51,52,53,54,55,56-octakis (chlorosulfonylphenoxyacetoxy)calix[8]arene (46) were synthesized by two different multistep reaction procedures, the last step of both methods consisting of the chlorosulfonation of compounds containing suitable activated aromatic positions. 2,4,6-Tris(chlorosulfonyl)aniline (47) was obtained by the chlorosulfonation of aniline. The conformation of two series of multisulfonyl chlorides i.e., 38, 39, 40 and 44, 45, 46, was investigated by 1H NMR spectroscopy. The masked nonreactive precursor states of the functional aromatic multisulfonyl chlorides and the aromatic multisulfonyl chlorides reported here represent the main starting building blocks required in a new synthetic strategy elaborated for the preparation of dendritic and other complex organic molecules.
Synthesis, X-Ray Crystal Structures, and Cation Transfer Properties of Alkyl Calixaryl Acetates, a New Series of Molecular Receptors
McKervey, M. Anthony,Seward, Eileen M.,Ferguson, George,Ruhl, Barbara,Harris, Stephen J.
, p. 388 - 390 (2007/10/02)
Calix-, -, and -arenes have been converted into a series of alkyl acetates which show significant phase-transfer activity and selectivity towards alkali metal picrates; the X-ray crystal structures of two members of the series, (1b) and (2d), have been determined.
