This review describes the recent application of trimethylsilyldiazomethane (Me
3SiCHN
2, TMSCHN
2), its lithium and magnesium bromide salts [TMSC(Li)N
2 and TMSC(MgBr)N
2] to the synthesis of heterocycles. Reaction of TMSCHN
2 with acyl isocyanates followed by Diels-Alder reaction with propiolates or
N-phenylmaleimide affords furans or bicyclic pyridones in a one-pot process, respectively. In addition, TMSCHN
2 is useful for the preparation of 2-azaazulenes, aziridines and indolizines. Meanwhile, TMSC(Li)N
2 reacts with benzynes generated from halobenzenes to yield 3-trimethylsilylindazoles, which are easily converted to 1-arylindazoles or indazoles bearing 3-hydroxymethyl units. TMSC(Li)N
2 is also applicable to the synthesis of indoles, benzofurans, pyrroles, thiophenes and 2,3-benzodiazepines. By using TMSC(MgBr)N
2, α-substituted β-trimethylsilyl-α,β-epoxyesters can be synthesized from α-ketoesters in a one-pot process. Reaction of TMSC(MgBr)N
2 with carbonyl compounds efficiently furnishes trimethylsilylated diazoalcohols, which react with propiolates to give di- or tri-substituted pyrazoles.
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