Synthesis of Oxazoles from Enamides via Phenyliodine Diacetate-Mediated Intramolecular Oxidative Cyclization
摘要:
A group of functionalized oxazoles were synthesized in moderate to good yields from enamides via phenyliodine diacetate (PIDA)-mediated intramolecular cyclization. The main advantageous features of the present method include its broad substrate scope and the heavy-metal-free characteristic of the oxidative carbon-oxygen bond formation process.
A group of functionalized oxazoles were synthesized in moderate to good yields from enamides via phenyliodine diacetate (PIDA)-mediated intramolecular cyclization. The main advantageous features of the present method include its broad substrate scope and the heavy-metal-free characteristic of the oxidative carbon-oxygen bond formation process.
Pyridine Syntheses.<b>II</b>. Condensation Routes Toward Streptonigrin Ring C
作者:J. Michael Robinson、Masood Ahmed、Nicky J. Alaniz、Timothy R. Boyles、Chris D. Brasher、Kimberly A. Floyd、Preston L. Holland、Laura D. Maruffo、Terry L. Mcmahan、Stan Middleton、Kevin D. O'Hara、Marcia J. Pack、Brandon D. Reynolds、Romelia R. Rodriquez、Dennis E. Sawyer、Elena Sharp、Sharai L. Simpson、Clint L. Vanlandingham、Rebecca S. Velasquez、Brian M. Welch、C. David Wright
DOI:10.1002/jhet.5570350113
日期:1998.1
Alternative complimentary syntheses of penta-substituted pyridinerings with full regiochemical control of substituents were studied as a method for the synthesis of Streptonigrin (1). Various α-substituted acetophenones 2 were reacted with enones 3 in acetic acid/ammonium acetate and air to afford penta-substituted pyridines 4. α-Substituents that could provide a source of exocyclic nitrogen at position