Novel applications of carbon dioxide/MeOH for the synthesis of hydantoins and cyclic ureas via the Ugi reaction
摘要:
This communication reveals novel applications of the CO2/MeOH reagent combination coupled with the UDC (Ugi/DeBOC/Cyclize) strategy. The Ugi five component condensation (5CC) affords carbamate protected amino-amides in good yield. When one of the supporting reagents employed in the Ugi reaction possesses a tethered amino-BOC protected functional group, subsequent acid treatment and proton scavenging results in rapid cyclization to cyclic ureas. Additionally, treatment of the 5CC product with base affords hydantoins in good yield, representing a novel and short approach to this class of molecule. (C) 2000 Elsevier Science Ltd. All rights reserved.
A Tris-hydroxymethyl-Substituted Derivative of Gd-TREN-Me-3,2-HOPO: An MRI Relaxation Agent with Improved Efficiency
作者:Sharad Hajela、Mauro Botta、Sabrina Giraudo、Jide Xu、Kenneth N. Raymond、Silvio Aime
DOI:10.1021/ja994315u
日期:2000.11.1
Gadolinium is used as a relaxation agent in magneticresonance imaging (MRI) because of its large paramagnetic moment, high water exchange rate, and consequent high proton relaxivity. However, the ion must be complexed to avoid toxicity. The Gd(III) complex of TREN-Me-3,2-HOPO ( 1) TREN-Me-3,2HOPO) tris[(3-hydroxy-1-methyl-2-oxo-1,2-didehydropyridine4-carboxamido)ethyl]amine } has been proposed as
stereoisomers with literature data for the natural product, the configuration of the previously unassigned stereocenters at C9 and C20 of haliclamide could be determined to be S for both carbons. The absolute configuration of haliclamide thus is 2S, 9S, 14R, 20S. The antiproliferative activity of synthetic haliclamide against several human cancer cell lines was found to be in the high μM range. The
在环化的基础上,通过闭环烯烃复分解合成了海洋天然产物卤代酰胺。使用用于组装二烯前体以进行复分解反应的四个结构单元中的两个的任一种的对映异构体,还制备了卤代酰胺的三种非天然异构体。根据各个立体异构体的1 H和13 C NMR光谱与天然产物的文献数据进行比较,可以确定先前未分配的卤代酰胺的C9和C20立体中心的构型对于两个碳都是S。因此,卤代酰胺的绝对构型为2 S,9 S,14 R,20 S。发现合成的哈利酰胺对几种人癌细胞系的抗增殖活性处于高μM范围内。该化合物没有抗真菌或抗生素活性。
Hiv Integrase Inhibitors
申请人:Williams D. Peter
公开号:US20080009490A1
公开(公告)日:2008-01-10
Bicyclic uracils and related compounds are inhibitors of HIV integrase and inhibitors of HIV replication. In one embodiment, the compounds are of Formula I:
wherein a, b, Y, R
1
, R
2
, R
3
and R
4
are defined herein. The compounds are useful in the prevention and treatment of infection by HIV and in the prevention, delay in the onset, and treatment of AIDS. The compounds are employed against HIV infection and AIDS as compounds per se or in the form of pharmaceutically acceptable salts. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines.
Cathepsin S inhibitors having formula (I), (II), (III) or (IV) as shown in the specification. These inhibitors can be used to treat cancer and autoimmune/inflammatory diseases.
Bicyclic uracils and related compounds are inhibitors of HIV integrase and inhibitors of HIV replication. In one embodiment, the compounds are of Formula I:
wherein a, b, Y, R1, R2, R3 and R4 are defined herein. The compounds are useful in the prevention and treatment of infection by HIV and in the prevention, delay in the onset, and treatment of AIDS. The compounds are employed against HIV infection and AIDS as compounds per se or in the form of pharmaceutically acceptable salts. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines.