Synthesis and Photochromism of Novel Phenylene-Linked Photochromic Bispyrans
作者:Weili Zhao、Erick M. Carreira
DOI:10.1021/ol052587y
日期:2006.1.1
[reaction: see text] Phenylene-linked bisnaphthopyrans were synthesized in good yields via the one-pot reaction of bis-propargyl alcohols with naphthols. Temperature-dependentphotochromism in 1,4-phenylene-linked bispyrans leads to up to 60 nm bathochromic shift between the colored species formed at room temperature and at -20 degrees C. Better fatigue resistance and higher colorability was observed
The atom-efficientcross-couplingreaction of triarylbismuths with a variety of aliphatic, aromatic, and hetero-aromatic acylchlorides was demonstrated to afford high yields of cross-coupled ketones under palladium catalysis. The corresponding cross-couplingreaction with diacid chlorides also furnished bis-coupled ketones in good yields.
Synthesis and biochemical evaluation of benzoylbenzophenone thiosemicarbazone analogues as potent and selective inhibitors of cathepsin L
作者:Erica N. Parker、Jiangli Song、G.D. Kishore Kumar、Samuel O. Odutola、Gustavo E. Chavarria、Amanda K. Charlton-Sevcik、Tracy E. Strecker、Ashleigh L. Barnes、Dhivya R. Sudhan、Thomas R. Wittenborn、Dietmar W. Siemann、Michael R. Horsman、David J. Chaplin、Mary Lynn Trawick、Kevin G. Pinney
DOI:10.1016/j.bmc.2015.09.036
日期:2015.11
Thiosemicarbazone analogue 32 inhibited invasion through Matrigel of MDA-MB-231 breast cancercells by 70% at 10 μM. Thiosemicarbazone analogue 8 significantly inhibited the invasive potential of PC-3ML prostate cancercells by 92% at 5 μM. The most active cathepsin L inhibitors from this benzoylbenzophenone thiosemicarbazone series (1, 8, and 32) displayed low cytotoxicity toward normal primary cells [in this
A Phosphane-Free, Atom-Efficient Cross-Coupling Reaction of Triarylbismuths with Acyl Chlorides Catalyzed by MCM-41-Immobilized Palladium Complex
作者:Hong Zhao、Lin Yin、Mingzhong Cai
DOI:10.1002/ejoc.201201432
日期:2013.3
The first phosphane-free, heterogeneous, atom-efficientcross-couplingreaction of triarylbismuths and acylchlorides was achieved in N-methylpyrrolidone (NMP) with Bu3N as the base at 80 °C in the presence of 1.5 mol-% MCM-41-immobilized bidentate nitrogen palladiumcomplex [MCM-41–2N-Pd(OAc)2, MCM = mobile crystalline material] to yield a variety of unsymmetrical biaryl ketones in good to excellent
Sulfonated block copolymer suitable for use as proton exchange membranes for fuel cells comprise sulfonated polyaryletherketone blocks and polyethersulfone blocks. The sulfonated polyaryletherketone blocks comprise structural units of formula I
wherein R
1
is C
1
-C
10
alkyl, C
3
-C
12
cycloalkyl, C
6
-C
14
aryl, allyl, alkenyl, alkoxy, halo, or cyano;
Ar
1
and Ar
2
are each independently C
6
-C
20
aromatic radicals, or Ar
1
and Ar
2
, taken together with an intervening carbon atom, form a bicyclic C
6
-C
20
aromatic radical or a tricyclic C
6
-C
20
aromatic radical;
M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof; and
a is 0 or an integer from 1 to 4.