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Cationic heterocyclization One step synthesis of condensed heterocyclics

โœ Scribed by J.B.P.A. Wijnberg; W.N. Speckamp; J.J.J. de Boer

Publisher
Elsevier Science
Year
1974
Tongue
French
Weight
160 KB
Volume
15
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

Dimerizations of cyclic enamines 1 (R=H2) occurring via iminium intermediates 2 (R=H2) are well-known 1) and have been applied recently in alkaloid synthe-sis2). Schematically the overall process can be represented as follows: R'

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โœ N.F. Eweiss; A. Osman ๐Ÿ“‚ Article ๐Ÿ“… 1979 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 108 KB

The 5-imino-A2-1,3,4\_thiadiazolines reported sofar' were prepared from hydrazidic halides and thiourea or KSCN. The preparation of the hydrazidic halides is limited to either the reaction of a hydrazide with PC15 or the halogenation of an aldehydic hydrazone2. In this communication we wish to repor