Synthesis of Furoxans and Isoxazoles via Divergent [2 + 1 + 1 + 1] Annulations of Sulfoxonium Ylides and <sup>t</sup>BuONO
作者:Zhonghe Tang、Yao Zhou、Qiuling Song
DOI:10.1021/acs.orglett.9b01876
日期:2019.7.5
isoxazoles in which the [2 + 1 + 1 + 1] annulation reaction of sulfoxonium ylides is reported for the first time. When the reaction was performed using tBuONO as the nitrogen source without metal catalyst, the desired furoxans were obtained in decent yields with wide substrate scope. Isoxazoles bearing three carbonyl groups were achieved when the reaction was conducted using Cu(TFA)2 as catalyst.
我们已经提出了一种简单的新方法,用于呋喃喃和异恶唑的分散组装,其中首次报道了亚砜基sulf的[2 +1 + 1 +1]环化反应。当使用t BuONO作为氮源而不使用金属催化剂进行反应时,可以在宽范围的底物范围内以适当的收率获得所需的呋喃烷。当使用Cu(TFA)2作为催化剂进行反应时,获得带有三个羰基的异恶唑。