Matches in SemOpenAlex for { <https://semopenalex.org/work/W1692502482> ?p ?o ?g. }
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- W1692502482 startingPage "170" @default.
- W1692502482 abstract "This chapter provides information on five-membered ring systems with N and S (Se) atoms. The chapter presents a discussion on (1) isothiazoles, (2) thiazoles, (3) thiadiazoles, (4) selenazoles, and (5) selenadiazoles. The cycloaddition reactions of both arylalkyl and aryl azides with the isothiazole 1,1-dioxide were found to be highly regioselective, leading to triazines. A variety of interesting ring expansions and annelations of 1,2-benzisothiazoles have been discussed giving rise to new heterocyclic ring systems. Thioamides react under mild conditions with conjugated azoalkenes to give thiazolines that exhibit hydrazono hydrazino tautomerism. Dithiolane isocyanate iminium methylides, are a new type of azomethine methylide derived 1,3-dipole, and undergo efficient and regioselective cycloaddition to thiocarbonyls to yield predominantly thiazolidine-2-thiones. Treatment of the thiadiazole with phenylhydrazine gave the hydrazone, which on methylation with Meerwein's reagent gave the thiapentalene. An alternative synthesis of 3,4-disubstituted 1,2,5-thiadiazoles was developed that involved the coupling reaction of 4-substituted 3-halogeno and 3-trifluoromethylsulphonyl 1,2,5-thiadiazoles with arylstannanes in the presence of palladium catalysts to give 4-substituted 3-aryl derivatives in good yields. Trithiazyl chloride (NSC1)3 has proved to be a versatile molecule for the synthesis of the 1,2,5-thiadiazole ring system." @default.
- W1692502482 created "2016-06-24" @default.
- W1692502482 creator A5030496085 @default.
- W1692502482 creator A5068428196 @default.
- W1692502482 date "1997-01-01" @default.
- W1692502482 modified "2023-09-25" @default.
- W1692502482 title "Chapter 5.5 Five-membered ring systems: With N & S (Se) atoms" @default.
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