1-Phenylisobenzofuran, 1-phenylnaphtho[2,3-c]furan, 1-phenylnaphtho[1,2-c]furan, and 3-phenylnaphtho[1,2-c]furan via cyclic hemiaminal, hemiacetal, and acetal precursors
The Baylis–Hillman acetates in organic synthesis: Unprecedented sodium nitrite induced intramolecular Friedel–Crafts cyclization of secondary nitro compounds
作者:Deevi Basavaiah、Daggula Mallikarjuna Reddy
DOI:10.1039/c4ra03573a
日期:——
Unprecedented sodium nitrite mediated intramolecularFriedel–Craftscyclization of alkyl (E)-2-arylidene-4-nitroalkanoates and (E)-3-arylidene-5-nitroalkan-2-ones derived from Baylis–Hillman acetates, providing a facile protocol for synthesis of naphthalenes, phenanthrenes, and carbazoles has been described.
作者:Ko Hoon Kim、Cheol Hee Lim、Jin Woo Lim、Jae Nyoung Kim
DOI:10.1002/adsc.201301169
日期:2014.3.10
An efficient intramolecular arene‐alkene oxidativecoupling of 1,4‐diaryl‐1,3‐butadienes has been developed involving the use of a 2,3‐dichloro‐5,6‐dicyano‐para‐benzoquinone (DDQ)/acid catalyst. The reaction involves the generation of a radical cation by abstraction of an electron from the substrate with DDQ, an intramolecular Friedel–Crafts‐type reaction, and the loss of hydrogen radical.