A removable functional group strategy for regiodivergent Wittig rearrangement products
作者:Md Nirshad Alam、Lakshmi K. M.、Pradip Maity
DOI:10.1039/c8ob02221f
日期:——
[1,2] and [2,3] Wittig rearrangements are competing reaction pathways, often leading to uncontrollable product distribution. We employ a single removable functional group to fulfill the dual role of attaining a reversible [2,3] and stabilizing radical intermediate for the [1,2] path to obtain both the Wittig products selectively for a broad range of substrates.
Herein, we report a novel regioselective [2 + 1] cyclization reaction of 2-pyridones with carbenes generated in situ via visible light irradiation, without the requirement for catalysts or additives. The diverse functional groups of 2-pyridones and diazo compounds exhibit good tolerance, enabling the rapidsynthesis of highly valuable cyclopropanated dihydro-2-pyridone scaffolds with exceptional regio-
Reactions of dimethylphosphono-substituted diazoalkanes. (MeO)2P(O)CR transfer to olefins and 1,3-dipolar additions of (MeO)2P(O)C(N2)R
作者:Dietmar Seyferth、Robert S. Marmor、Peter Hilbert
DOI:10.1021/jo00809a014
日期:1971.5
Reactions of 1-Oxoalkanephosphonate Tosyhydrazones with Sodium Borohydride: A New Synthesis of Dimethyl Alkanephosphonates and Dimethyl 1-Diazoalkanephosphonates