I2-Promoted Selective Oxidative Cross-Coupling/Annulation of 2-Naphthols with Methyl Ketones: A Strategy To Build Naphtho[2,1-b]furan-1(2H)-ones with a Quaternary Center
摘要:
A highly efficient and selective molecular iodine-promoted oxidative cross-coupling/annulation between 2-naphthols and methyl ketones has been realized. The reaction successfully constructed a new quaternary carbon center within 3(2H)-furanones. Our synthetic strategy provided an in situ iodination-based oxidative coupling pathway. Based on the experimental results, a self-sequenced iodination/Kornblum oxidation/Friedel-Crafts/oxidation/cyclization mechanism was proposed.
Cascade Rh(<scp>ii</scp>) and Yb(<scp>iii</scp>) catalyzed synthesis of substituted naphthofurans <i>via</i> transannulation of <i>N</i>-sulfonyl-1,2,3-triazoles with β-naphthols
An efficient cascade Rh(II) and Yb(III) catalyzed transannulation of N-sulfonyl-1,2,3-triazoles with β-naphthols has been accomplished for the synthesis of substituted naphthofurans in good yields. The reaction involves the initial rhodium catalyzed insertion of azavinyl carbene into the O–H bond followed by ytterbium catalyzed annulative C–C bond formation and concomitant aerial oxidation. The developed
2-Oxo Driven Unconventional reactions: Microwave Assisted Approaches to Tetrahydrofuro[3,2-<i>d</i>]oxazoles and Furanones
作者:Narsaiah Battini、Satyanarayana Battula、Raju Ranjith Kumar、Qazi Naveed Ahmed
DOI:10.1021/acs.orglett.5b01271
日期:2015.6.19
A highly efficient, novel, microwave-assisted, metal-free, diastereoselective synthesis of tetrahydrofuro[3,2-d]oxazole is disclosed. The synthesis of napthoxazoles is achieved for the first time without the aid of an external catalyst. On the contrary, our reactions generated naphthofuranones when treated in the presence of metals in microwave/thermal conditions. The unusual behavior of our reactions has further been explored in the generation of furanones from tetrahydrofuro[3,2-d]oxazole through the use of metals.