Synthesis of the indole series—III : Preparation of 5-, 6-, and 7-cyano and -carboxyindolines and -indoles
Tetrahedron, Volume 23, Issue 9, 1967, Pages 3823-3827
R. Ikan and E. Rapaport
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http://dx.doi.org/10.1016/0040-4020(67)80029-2
Tetrahedron Letters, Volume 35, Issue 2, 10 January 1994, Pages 219-222
Michael G. Vetelino and Jotham W. Coe
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http://dx.doi.org/10.1016/S0040-4039(00)76515-4