Visible-Light-Promoted Selenylation/Cyclization of o-Alkynyl Benzylazides/o-Propargyl Arylazides: Synthesis of Seleno-Substituted Isoquinolines and Quinolines
A new, selective method for the synthesis of 4-haloisoquinolines and 3-haloindoles is presented by the halopalladation cyclizations of alkynes with azides. In the presence of PdX2 (X = Br, Cl) and halide sources, a variety of 2-alkynylbenzylazides or 2-alkynyl aryl azides smoothly underwent the halopalladation cyclization reaction to afford the corresponding 3-substituted 4-haloisoquinolines and
A PdI2/I2-catalyzed thiolation-annulation route of alkynes with azides and disulfides for the synthesis of 4-sulfenylisoquinolines is described. This route allows numerous 2-alkynylbenzyl azides to react with disulfides or 1,2-diphenyldiselane leading to the corresponding 4-chalcogen-substituted isoquinolines in moderate to good yields.
A Novel Method for the Synthesis of Haloisoquinolines Involving an Electrophile-exchange Process
作者:Hong-Ping Zhang、Hong-Yan Li
DOI:10.3184/174751914x14140703941872
日期:2014.11
A synthesis of haloisoquinolines through electrophilic cyclisation involving an electrophilic-exchange process has been developed. A variety of 2-alkynylbenzylazides are cyclised in the presence of KX (X = I, Br, Cl) and electrophilic fluoride reagents, to afford the corresponding haloisoquinolines in moderate to good yields. Reagents for electrophilic halogenation have been generated from their
A Selective Synthesis of 4-Bromoisoquinoline and 4-Bromoisquinolone
作者:Hong-Ping Zhang、Hong-Yan Li、Hong-Fang Xiao
DOI:10.3184/174751913x13744287541024
日期:2013.9
palladium to selectively afford either 4-bromoisoquinoline and 4-bromoisquinolones under different conditions. 4-Bromoisoquinoline was synthesised in the presence of PdBr2/CuBr2/LiBr in MeCN, and 4-bromoisoquinolone was selectively produced with PdBr2/CuBr2/HOAc in CH2ClCH2Cl. A bromine was introduced into the products which makes the methodology more attractive for organic synthesis.