Continuous Chemoselective Methylation of Functionalized Amines and Diols with Supercritical Methanol over Solid Acid and Acid−Base Bifunctional Catalysts
bifunctional catalysts (Cs-P-Si mixed oxide and gamma-alumina) was investigated in a continuous-flow, fixed-bed reactor. The use of scCH(3)OH in the reaction of 2-aminoethanol with methanol (amine/CH(3)OH = 1/10.8) over the solid catalysts led to a significant improvement in the chemoselectivity of the N-methylation. Among the catalysts examined, the Cs-P-Si mixed oxide provided the most efficient catalyst
Potential antitumor agents. Part 43. Synthesis and biological activity of dibasic 9-aminoacridine-4-carboxamides, a new class of antitumor agent
作者:Graham J. Atwell、Bruce F. Cain、Bruce C. Baguley、Graeme J. Finlay、William A. Denny
DOI:10.1021/jm00377a017
日期:1984.11
The synthesis and biological activities of representatives of a new class of antitumor agent, the N-[2-(dialkylamino)ethyl ]-9-aminoacridine-4-carboxamides, are reported. Members of this class are stable and very water soluble with high levels of in vitro and in vivo antitumor activity. The compounds bind tightly to double-stranded DNA by intercalation, but the requirements for antitumor activity are
Synthesis of molecular sieves having the chabazite framework type and their use in the conversion of oxygenates to olefins
申请人:Cao Guang
公开号:US20070043249A1
公开(公告)日:2007-02-22
The synthesis of a crystalline aluminophosphate or silicoaluminophosphate molecular sieve having a chabazite-type framework type is conducted in the presence of an organic directing agent having the formula (I)
[R
1
R
2
R
3
N—R
4
]
+
X
−
(I)
wherein R
1
, R
2
and R
3
are independently selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms and hydroxyalkyl groups having from 1 to 3 carbon atoms; R
4
is selected from the group consisting of 4- to 8-membered cycloalkyl groups, optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms; 4- to 8-membered heterocyclic groups having from 1 to 3 heteroatoms, said heterocyclic groups being optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms and the heteroatoms in said heterocyclic groups being selected from the group consisting of O, N, and S; and aromatic groups optionally substituted by 1 to 3 alkyl groups, said alkyl groups having from 1 to 3 carbon atoms; and X
−
is an anion.
function of teicoplanin A2 (CTA) and its acidic hydrolysis pseudoaglycons (TB, TC) and aglycon (TD) with amines carrying various functional groups and chains produced amide derivatives with different isoelectric points and lipophilicities. Amide formation did not affect the ability of these compounds to bind to Ac2-L-Lys-D-Ala-D-Ala, a model for the natural peptide binding site in bacterial cell walls
Synthesis and use of aluminophosphates and silicoaluminophosphates
申请人:——
公开号:US20040215044A1
公开(公告)日:2004-10-28
Disclosed are methods and compositions of synthesis mixtures for the synthesis of aluminophosphates and silicoaluminophosphate molecular sieves, which enable the control and adjustment of the crystal particle size of aluminophosphates and silicoaluminophosphate molecular sieves. The synthesis mixture compositions used have two or more organic templates present at a molar ratio of total template to aluminum of ≦1.25; such a synthesis mixture is susceptible to control of product particle size through variation in the amount of seeds used in the synthesis.