Synthesis of thiazolo[4,3-a]isoindoles by intramolecular cycloaddition-elimination reactions of 4-methyl-5-(substituted)imino-Δ2-1,2,3,4-thiatriazolines
摘要:
Fused thiazolidine 11 and thiazoline derivatives 19a-c are obtained by intramolecular cycloaddition-elimination reactions of appropriately substituted 5-iminothiatriazolines 10 and 18a-c. The incorporation of a sidechain phenyl group excercises a favorable effect on cyclization since no reaction is observed with 25. Comparable intermolecular reactions also fail to occur.
Intramolecular homolytic aromatic substitution of alkyl 2-benzimidazolyl sulfones as a means of entry into alkyl radicals for organic synthesis
作者:David Crich、Daniel Grant
DOI:10.1016/j.tetlet.2008.02.174
日期:2008.4
radical aromatic substitution of heteroaryl sulfones by tethered aryl radicals has been investigated as a source of alkyl radicals. The 1-(2-iodobenzyl)benzimidazole-2-sulfonyl system was found to be the most effective, while a tetrazole-based system did not undergo the desired radical aromatic substitution at all. Application of the benzimidazole-based system to the generation of alkyl radical and their
Characterization of the Binding Site of the Histamine H<sub>3</sub> Receptor. 2. Synthesis, in Vitro Pharmacology, and QSAR of a Series of Monosubstituted Benzyl Analogues of Thioperamide
作者:Albert D. Windhorst、Henk Timmerman、Edward A. Worthington、Greetje J. Bijloo、Paul H. J. Nederkoorn、Wiro M. P. B. Menge、Rob Leurs、Jacobus D. M. Herscheid
DOI:10.1021/jm981106w
日期:2000.5.1
A series of monosubstituted benzylanalogues of the histamine H(3) receptor antagonist thioperamide were synthesized and evaluated for their histamine H(3) receptor activity on the guinea pig jejunum. Incorporation of Cl, Br, and I at the ortho position of the benzyl moiety led to an increase of the pA(2) value, whereas the same substituents at the para position led to a decrease. However, a fluorine