An approach to the design of molecular solids. The ureylene dicarboxylic acids
作者:Xinqi Zhao、Yuh Loo Chang、Frank W. Fowler、Joseph W. Lauher
DOI:10.1021/ja00174a026
日期:1990.8
The crystalstructures of a series of ureylenedicarboxylic acids have been determined as part of a project directed toward the design of molecular solids. The ureylenedicarboxylic acids were chosen for study because they were predicted to form a two-dimensional hydrogen-bonded network. This two-dimensional network is the result of two orthogonal linear arrays of self-complementary hydrogen-bonded functionalities
phenethylamine derivatives, underwent a direct aromatic carbonylation to afford five- or six-membered benzolactams. In the carbonylation, the chelation effect or steric repulsion between Pd(II) and the meta-substituent in the ortho-palladation and the ring sizes of cyclopalladation products that were formed prior to carbonylation were found to generate good site selectivity and increase the reaction rate. In
A convenient synthesis of symmetrical N,N′-dialkylureas by the reactions of 4-chloro-5H-1,2,3-dithiazol-5-one with alkylamines
作者:Yong-Goo Chang、Hyi-Seung Lee、Kyongtae Kim
DOI:10.1016/s0040-4039(01)01761-0
日期:2001.11
Treatment of 4-chloro-5H-1,2,3-dithiazol-5-one with primary and secondary alkylamines (>2 equiv.) in CH2Cl2 at rt afforded symmetrical N,N′-disubstituted ureas in moderate to good yields. Similarly, the reactions with amino acid ester hydrochlorides in the presence of Et3N (>3 equiv.) under the same conditions gave symmetrical ureas.
在室温下,在CH 2 Cl 2中用伯和仲烷基胺(> 2当量)处理4-氯-5 H -1,2,3-二噻唑-5-酮,得到对称的N,N'-二取代脲良品率高。类似地,在相同条件下,在Et 3 N(> 3当量)存在下,与氨基酸盐酸盐的反应生成对称的脲。
An approach to the design of molecular solids. Strategies for controlling the assembly of molecules into two-dimensional layered structures
作者:Yuh Loo Chang、Mary Ann West、Frank W. Fowler、Joseph W. Lauher
DOI:10.1021/ja00067a014
日期:1993.7
A design strategy for the synthesis of molecular crystals confining two-dimensional layers is formulated and demonstrated by the synthesis and structure determination of a series of dicarboxylic acid urea derivatives. The design strategy is based upon the selection of complementary hydrogen bond functionalities and an accounting of the specific symmetry operators that must correspond to each intermolecular
通过一系列二羧酸尿素衍生物的合成和结构测定,制定并证明了用于合成限制二维层的分子晶体的设计策略。设计策略基于互补氢键官能团的选择以及必须对应于分子晶体内每个分子间相互作用的特定对称算符的计算。研究的每个分子都包含一个双取代的尿素官能团,预期通过尿素氢键形成一维氢键网络,即α-网络。这些分子还包含末端羧酸或酰胺残基,预计这些残基会通过额外的氢键将 a 网络连接成二维 β 网络
[EN] ANALOGUES OR DERIVATIVES OF QUERCETIN (PRODRUGS)<br/>[FR] ANALOGUES OU DERIVES DE QUERCETINE (PROMEDICAMENTS)
申请人:COBRA THERAPEUTICS LIMITED
公开号:WO1997049693A1
公开(公告)日:1997-12-31
(EN) Novel carbamate ester analogues or derivatives of Quercetin (prodrugs) are provided which have enhanced aqueous solubility and which are especially suitable for use as biodegradable prodrugs in pharmaceutical compositions formulated for clinical use.(FR) Nouveaux analogues ou dérivés d'ester de carbamate de quercétine (promédicaments) présentant une hydrosolubilité améliorée et pouvant être utilisés avantageusement en tant que promédicaments biodégradables dans des compositions pharmaceutiques formulées pour une utilisation clinique.