A new noncentrosymmetric strontium borate, P1-Sr2[B5O8(OH)]2·[B(OH)3]·H2O (1), has been synthesized under the hydrothermal condition. The P1-Sr2[B5O8(OH)]2·[B(OH)3]·H2O shows a layered B-O network with 9-ring windows in the ab plane. Sr2+ cations,...
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Rh‐Catalyzed Chemodivergent [3+3] Annulations of Diazoenals and α‐Aminoketones: Direct Synthesis of Functionalized 1,2‐Dihydropyridines and Fused 1,4‐Oxazines
Chemistry – A European Journal, März 2024, DOI. Login für Volltextzugriff.
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The reaction of rhodium enalcarbenoids with α-amino ketones has led to the discovery of chemodivergent [3+3] annulations. Acyclic α-amino ketones reacted via a protic ammonium ylide resulting in 1,2-dihydropridines (1,2-DHPs). In contrast, cyclic α-aminoketones gave fused 1,4-oxazines via a vinylogous protic ammonium ylide due to a topology-driven regioselectivity switch. The 1,2-DHP and 1,4-oxazine products serve as precursors to diverse N-heterocycles. More information can be found in the Research Article by P. K. Mandal and S. Katukojvala (DOI: 10.1002/chem.202303862).
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