One-Pot Friedel−Crafts/Robinson−Gabriel Synthesis of Oxazoles Using Oxazolone Templates
作者:Manasi Keni、Jetze J. Tepe
DOI:10.1021/jo0501590
日期:2005.5.1
We report herein a one-potsynthesis of 2,4,5-trisubstituted oxazoles via a Friedel−Crafts/Robinson−Gabriel synthesisusing a general oxazolone template. Treatment of the oxazolone template with a range of aromatic nucleophiles provided the highly substituted oxazoles in good yields.
Synthesis of Oxazoles through Copper-Mediated Aerobic Oxidative Dehydrogenative Annulation and Oxygenation of Aldehydes and Amines
作者:Zejun Xu、Chun Zhang、Ning Jiao
DOI:10.1002/anie.201206382
日期:2012.11.5
A fragment‐assembling strategy is used to form oxazoles from aryl acetaldehydes, amines, and molecular oxygen under mild conditions (see scheme). The transformation is highly efficient with the removal of six hydrogen atoms, including the cleavage of four C(sp3)H bonds.
Synthesis of 2,5-Disubstituted Oxazoles from Arylacetylenes and α-Amino Acids through an I2/Cu(NO3)2•3H2O-Assisted Domino Sequence
作者:Anxin Wu、Jungang Wang、Yan Cheng、Jiachen Xiang
DOI:10.1055/s-0037-1612087
日期:2019.4
5-disubstituted oxazoles from easily available arylacetylenes and α-amino acids in the presence of Cu(NO3)2•3H2O and iodine. This reaction process involves the I2/Cu(NO3)2•3H2O-assisted transformation of arylacetylene to α-iodo acetophenone, Kornblum oxidation to phenylglyoxal, condensation to imine, decarboxylation/annulation/oxidation reaction sequence to approach 2,5-disubstituted oxazoles.
A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles
作者:Weisen Yang、Rongli Zhang、Feiyan Yi、Mingzhong Cai
DOI:10.1021/acs.joc.7b00386
日期:2017.5.19
heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminalalkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine–gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can
A facile one-pot synthesis of 2,5-disubstituted oxazoles using iodobenzene diacetate
作者:Rajender S. Varma、Dalip Kumar
DOI:10.1002/jhet.5570350654
日期:1998.11
A facileone-potsynthesis of oxazoles 1a-h is described that utilizes readily available aromatic α-methyl ketones and a safe hypervalent iodine reagent, iodobenzenediacetate.