Synthesis of (+)- and (-)-Mellein Utilkizing an Annelation Reaction of Isoxazoles with Dimethyl 3-Oxoglutarate
摘要:
Naturally occurring dihydroisocoumarins, (+)- and (-)-mellein (2 and 3), metabolites of fungals, Cercospora sp. and Aspergillus sp., etc., were synthesized from the isoxazoles (32) and (33) by the annelation reactions with dimethyl 3-oxoglutarate.
Synthesis of (+)- and (-)-Mellein Utilkizing an Annelation Reaction of Isoxazoles with Dimethyl 3-Oxoglutarate
摘要:
Naturally occurring dihydroisocoumarins, (+)- and (-)-mellein (2 and 3), metabolites of fungals, Cercospora sp. and Aspergillus sp., etc., were synthesized from the isoxazoles (32) and (33) by the annelation reactions with dimethyl 3-oxoglutarate.
TEMPO-catalyzed synthesis of 5-substituted isoxazoles from propargylic ketones and TMSN<sub>3</sub>
作者:Yan He、Yu-yang Xie、Ying-chun Wang、Xiao-min Bin、Da-chao Hu、Heng-shan Wang、Ying-ming Pan
DOI:10.1039/c6ra11099a
日期:——
A novel and efficient TEMPO-catalyzed synthesis of 5-substituted isoxazoles from propargylic ketones and TMSN3 via a radical mechanism process is described. This methodology provides an easy access to a variety of useful 5-substituted isoxazoles from simple and readily available propargylic ketones and TMSN3 in good to excellent yields. A plausible reaction mechanism for this process is proposed.