Syntheses, Structures, and Reactivity of 2,5-Diboryl-1-alkylpyrroles and Di(1-alkyl-2-pyrrolyl)boranes

✍ Scribed by Jürgen Faderl; Bernd Deobald; Roger Guilard; Hans Pritzkow; Walter Siebert

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 281 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199903)1999:3<399::aid-ejic399>3.0.co;2-i

✦ Synopsis

Reactions of 2,5-dilithiated 1-methylpyrrole (1a) with the aryloxy-boryl derivative 2e. Reacting monolithiated 1methyl-and 1-benzylpyrroles with Cl 2 BNiPr 2 yields the di(2-ClB(NR 2 ) 2 lead to the novel 2,5-diboryl-1-methylpyrroles 2a and 2b. Accordingly, 2,5-diboryl-1-benzylpyrrole 2d is pyrrolyl)boranes 3e and 3f, respectively. NMR and MS data are in agreement with the compositions of the compounds, obtained. 1a and Cl 2 BNiPr 2 form the aminochloroborylsubstituted derivative 2c and the di(5-boryl-2-which are confirmed by X-ray structure analyses for 2a, 2b, 2d, und 3e. pyrrolyl)borane 4 in 29% and 15% yield, respectively. The 2,5-distannyl-1-methylpyrrole 1c is used for the synthesis of is reduced to the dianion E. As a first example of a tetra- [a] Anorganisch-