Preparation of isoxazol(in)yl substituted selenides and their further deselenenylation reaction to synthesize 3,5-disubstituted isoxazoles
摘要:
We report a mild 1,3-dipolar cycloaddition protocol for the preparation of 3-aryl-5-phenylselenomethyl isoxazoles and isoxazolines regioselectively. The former was further reacted with LDA and electrophilic substrates followed by selenoxide syn-elimination to afford 3-aryl-5-E-substituted-ethenyl isoxazoles stereoselectively and the latter was subjected to a 'two-step' elimination to afford 3-aryl-5-methyl isoxazoles. (C) 2004 Elsevier Ltd. All rights reserved.
Preparation of isoxazol(in)yl substituted selenides and their further deselenenylation reaction to synthesize 3,5-disubstituted isoxazoles
摘要:
We report a mild 1,3-dipolar cycloaddition protocol for the preparation of 3-aryl-5-phenylselenomethyl isoxazoles and isoxazolines regioselectively. The former was further reacted with LDA and electrophilic substrates followed by selenoxide syn-elimination to afford 3-aryl-5-E-substituted-ethenyl isoxazoles stereoselectively and the latter was subjected to a 'two-step' elimination to afford 3-aryl-5-methyl isoxazoles. (C) 2004 Elsevier Ltd. All rights reserved.