Regioselective 1,3‐Dipolar Cycloadditions of Thiocarbonyl Ylides with 1,3‐Thiazole‐5(4__H__)‐thiones The thiocarbonyl ylides 13 and 1,3‐thiazol‐5(4__H__)‐thiones __1__ undergo a smooth reaction to yield spirocyclic 1,3‐dithiolanes 14–16 (__Schemes 4–6__). The 1,3‐dipolar cycloadditions occur in a r
N-(1,3-Thiazol-5(4H)-yliden)amine aus 1,3-dipolaren Cycloadditionen von Aziden mit 1,3-Thiazol-5(4H)-thionen
✍ Scribed by Sare Pekcan; Heinz Heimgartner
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- German
- Weight
- 458 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
N-(I ,3-Thiazol-5(4H)-ylidene)amines via 1,3-Dipolar Cycloaddition of Azides and 1,3-Thiazol-5(4H)-thiones Organic azides 5 and 4,4-dimethyl-2-phenyI-1,3-thiazol-5(4H)-thione (2) in toluene at 90" react to give the corresponding N-(1,3-thiazol-5(4H)-ylidene)amines ( = 1,3-thiazol-5(4H)-imines) 6 in good yield (Table ). A reaction mechanism for the formation of these scarcely investigated thiazole derivatives is formulated in Scheme 3:
1,3-Dipolar azide cycloaddition onto the C=S group of 2 leads to the 1 : 1 adduct C. Successive elimination of N, and S yields 6, probably uiu an intermediate thiaziridine E.
📜 SIMILAR VOLUMES
RolfHuisgen zum 73. Geburtstag gewidmet (29.111.93
190, CH-8057 Zurich (22.1X.86) ## Carbophilic Additions of Organocuprates and 1,3-Thiazole-5(4H)-thiones Organocuprates and 1,3-thiazole-S(4H)-thiones 1 react in THF at 0" via carbophilic addition onto the C=S bond to give 4,S-dihydro-l,3-thiazole-S-thiols 3 (Scheme 3 ) . This observation is in m
Uber den thermischen Zerfall dieser Heterocyclen (N,-Abspaltung) wurde in [14] nichts berichtet Einen weiteren Hinweis liefern die Abfangreaktionen im Falle der Umsetzung rnit l c (s. spater).
1,3‐Dipolar Cycloadditions of a Carhonyl‐ylide with 1,3‐Thiazole‐5(4__H__)‐thiones and Thioketones In__p__‐xylene at 150°, 3‐phenyloxirane‐2,2‐dicarbonitrile (4b) and 2‐phenyl‐3‐thia‐1‐azaspiro[4.4]non‐1‐ene‐4‐thione (1a) gave the three 1:1 adduets __trans__‐3a, __cis__‐3a, and 13ain 61, 21, and 3%