A Major Breakthrough in the Use of Alkoxycarbene Complexes of Chromium and Tungsten for the Synthesis of Elaborate Organic Compounds: Dihydropyridine Induced Reductions and Cascade Insertion Reactions

✍ Scribed by H. Rudler; A. Parlier; T. Durand-Réville; B. Martin-Vaca; M. Audouin; E. Garrier; V. Certal; J. Vaissermann

• Book ID: 104202641
• Publisher: Elsevier Science
• Year: 2000
• Tongue: French
• Weight: 460 KB
• Volume: 56
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(00)00214-3

✦ Synopsis

AbstractÐAlkoxy (alkyl)carbene complexes of tungsten and chromium react with dihydropyridine and N-methyldihydropyridine to give respectively pyridinium ylid complexes and N-methylpyridinium tungstates and chromates. These two types of complexes can be used, for the former, as cyclopropanation reagents, for the latter, as unprecedented initiators of cascade multiinsertions of ole®ns, alkynes and CO. These insertions lead to elaborate polycyclic compounds.