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2005
Ring closure reactions
O 0130
Synthetic Applications of Aryl Radical Building Blocks for Cyclization onto
— Azoles are alkylated with mesylate (II) to give intermediate aryl radicals.
30- 039 Azoles.
They undergo intramolecular cyclization to afford tri- and tetracyclic heterocycles mediated by tributyltin hydride or tributylgermanium hydride. The new method is applicable to imidazoles, pyrroles, indoles and pyrazoles. Pyrazole (X) can also be used for
conversion on solid phase resins. — (ALLIN, S. M.; BOWMAN*, W. R.;
ELSEGOOD, M. R. J.; MCKEE, V.; KARIM, R.; RAHMAN, S. S.; Tetrahedron 61
(2005) 10, 2689-2696; Dep. Chem., Loughborough Univ., Loughborough, Leicestershire LE11 3TU, UK; Eng.) — S. Adam
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