Gold-Catalyzed Cycloisomerizations of 1-(2-(Tosylamino)phenyl)prop-2-yn-1-ols to 1<i>H</i>-Indole-2-carbaldehydes and (<i>E</i>)-2-(Iodomethylene)indolin-3-ols
作者:Prasath Kothandaraman、Srinivasa Reddy Mothe、Sharon Si Min Toh、Philip Wai Hong Chan
DOI:10.1021/jo201208e
日期:2011.10.7
)indolin-3-ols by gold(I)-catalyzed cycloisomerization of 1-(2-(tosylamino)phenyl)prop-2-yn-1-ols with N-iodosuccinimide (NIS) is reported. The reactions were shown to be operationally simplistic and proceed efficiently for a wide variety of substrates, affording the corresponding products in good to excellent yields (70–99%). The mechanism is suggested to involve activation of the alkyne moiety of
Metal-free synthesis of 1H-indole-2-carbaldehydes by N-iodosuccinimide-mediated cyclization of 1-(2′-anilinyl)prop-2-yn-1-ols in water. A formal synthesis of (R)-calindol
作者:Prasath Kothandaraman、Sherman Jun Liang Lauw、Philip Wai Hong Chan
DOI:10.1016/j.tet.2013.06.032
日期:2013.9
cycloisomerization of 1-(2-aminophenyl)prop-2-yn-1-ols is described. The reaction is operationally straightforward and accomplished in good to excellent yields (48–91%) from a wide range of alcohol substrates that are low cost, easily accessible, and ecologically benign. The utility of the approach as a potential scale-up strategy for the synthesis of the indole was exemplified by the large-scale synthesis of one
Gold-Catalyzed Cycloisomerization Reactions of 2-Tosylaminophenylprop-1-yn-3-ols as a Versatile Approach for Indole Synthesis
作者:Prasath Kothandaraman、Weidong Rao、Shi Jia Foo、Philip Wai Hong Chan
DOI:10.1002/anie.201000341
日期:2010.6.21
A great combination: A putative indolyl‐substituted vinyl gold species generated in situ from AuCl/AgOTf catalyzed the title transformation. Under these reaction conditions, indenyl‐fused and 2,3‐disubstituted indole derivatives were produced in good to excellent yields of up to 94 % (see scheme).