ChemInform Abstract: Synthesis of Cyclic N‐Thioacylamidines from Aminothiocarbonyl Compounds and Activated Lactames.

Liebscher, J.; Paetzel, M.; Bechstein, Ute

doi:10.1002/chin.198702123

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“…[57] When 100 was treated with various alkylating agents like substituted benzyl bromides or chlorides, or phenacyl halogenides, the S-alkyl derivatives 102 were obtained, which underwent ring closure to thiazoles 103. [58] Contrary to the examples described above, the semicyclic aminoacrylonitrile 104 contains an exo double bond activ- Scheme 13 ating position 2. Its reaction with hydrazine follows the general route, and results in formation of the pyrazole compound 105.…”

Section: E Pseudo Ring Transformations (Ring Chain Transformations)mentioning

confidence: 93%

Recent Advances in Ring Transformations of Five-Membered Heterocycles and Their Fused Derivatives

2001

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Keywords: Ring opening / Isomerizations / Cyclizations / Heteroaromaticity / RearrangementsRing transformations of five-membered heterocycles and their benzologues for the recent 10 years are discussed and reviewed. These transformations are classified into four groups: (a) ''classical ring transformations'', where the starting and resulting ring system is of the same size, but the heteroatoms and/or their positions have been changed; (b) ''degenerate ring transformations'', where during the course of the transformation the starting compound and product have the same ring system, but the reaction proceeds by a A. IntroductionRearrangements of heterocyclic rings by temporary opening and subsequent closure to a new molecule are of par- [a] (1993). His research interests are mainly devoted to heterocyclic chemistry, synthesis and application of isotopically labelled compounds and, more recently, macrocyclic ring systems with regard to host-guest chemistry.MICROREVIEWS: This feature introduces the readers to the authors' research through a concise overview of the selected topic. Reference to important work from others in the field is included.

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Section: E Pseudo Ring Transformations (Ring Chain Transformations)mentioning

confidence: 93%

Recent Advances in Ring Transformations of Five-Membered Heterocycles and Their Fused Derivatives

2001

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ChemInform Abstract: Synthesis of Cyclic N‐Thioacylamidines from Aminothiocarbonyl Compounds and Activated Lactames.

Abstract: Derivatives of lactames such as amide‐chlorides or lactame‐acetals, are synthesized in situ by the reaction of (I) with POCl3 or with (CH3)2SO4/NaOEt.

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Recent Advances in Ring Transformations of Five-Membered Heterocycles and Their Fused Derivatives

Recent Advances in Ring Transformations of Five-Membered Heterocycles and Their Fused Derivatives

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