A Simple and Practical Synthesis of 2-Aminoimidazoles
摘要:
A new and simple two-step procedure to synthesize 2-aminoimidazoles (2-AI's) from readily available materials has been developed. The cyclization reaction of alpha-halo ketones and N-acetylguanidine in acetonitrile (MeCN) at reflux, or in dimethylformamide (DMF) at ambient temperature, gives 4(5)-substituted and 4,5-disubstituted N-(1H-imidazol-2-yl)acetamides, which are then hydrolyzed to their respective 2-AI's. In general, the purified products were isolated in good yields. We have prepared several examples and have demonstrated the usefulness of this method by its application in the total synthesis of 8, an interesting histamine analog, and oroidin, 15, a marine natural product isolated from various sponges.
In one aspect, the invention relates to compounds having the formula I:
where R
1
-R
6
are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising these compounds; methods of using these compounds; and processes and intermediates for preparing these compounds.
N-Aryl benzamides wherein the aryl group is a nitrogen containing heterocycle are useful as selective herbicidal agents. Compositions containing the novel benzamides and a herbicidal method of selective weed control are disclosed.
Conformer independent heterodimerisation of linear arrays using three hydrogen bonds
作者:Andrea M. McGhee、Colin Kilner、Andrew J. Wilson
DOI:10.1039/b712603d
日期:——
5-Membered heterocycles are employed to give a conformer independent DDA array of hydrogen bonds, resulting in enhanced binding affinity to a complementary AAD array in comparison to a DDA array employing a 6-membered ring.
N-Aryl benzaimides wherein the aryl group is a nitrogen containing heterocycle are useful as selective herbicidal agents. Compositions containing the novel benzamides and a herbicidal method of selective weed control are disclosed.
The present disclosure relates to Shape Memory Polymers (SMP's) comprising function groups that allow the polymers to be elastically deformed, utilized in the elastically deformed state, and subsequently returned to the original polymorphic shape.