Abstract
Reaction between lithiated allenic compounds and isothiocyanates, R1 N=C=S, in most cases gives exclusively thioimidates with the allenic structure, C=C=CC(SLi)=NR1 . These intermediates have been used in novel approaches to 2,3-dihydropyridines,
pyrroles, quinolines, cyclobutanopyrrolines, and thiophene or dihydrothiophene derivatives.
The procedures leading to the heterocycles with a nitrogen atom in the ring involve
S- alkylation followed by simple heating or by treatment with copper(I) halide. 2-Aminothiophenes
and 2-imino-2,5-dihydrothiophenes are formed by intramolecular nucleophilic attack
of the thiolate moiety on the allenic system and subsequent addition of methyl iodide
or protonation.
1 Introduction
2 Generation of Allenic Lithium Compounds
3 Formation of 2,3-Dihydropyridines or Mixtures of 2,3-Dihydropyridines and Pyrroles
4 Directed Synthesis of Pyrroles
5 Synthesis of Quinolines
6 Synthesis of Cyclobutanopyrrolines
7 Synthesis of Thiophene and Dihydrothiophene Derivatives
8 Concluding Remarks
Key words
thioimidates - azatrienes - 2,3-dihydropyridines - pyrroles - quuinolines - cyclobutanopyrrolines
- 2-aminothiophenes - 2-imino-2,5-dihydrothiophenes
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