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Periselective, Lewis acid-induced intramolecular Diels–Alder reaction of conjugated carbodiimides: efficient synthesis of nitrogen heterocycles, indolo[2,3-b]quinolines and pyrido[2,3-b]indole

1993; Royal Society of Chemistry; Issue: 24 Linguagem: Inglês

10.1039/c39930001802

2050-5639

Takao Saito, Hiromasa Ohmori, Takahiro Ohkubo, Shinichi Motoki,

Oxidative Organic Chemistry Reactions

A suitable Lewis acid has been found that accelerates the intramolecular Diels–Alder reaction of conjugated carbodiimides with high periselectivity control, thus providing an efficient and straightforward procedure for constructing indolo[2,3-b]quinoline and pyrido[2,3-b]indole frameworks.