Synthesis of azahomosteroid ring system through intramolecular [4+2] cycloaddition of in situ generated azaisobenzofuran intermediates
作者:Priyabrata Roy、Partha Mitra、Binay Krishna Ghorai
DOI:10.1016/j.tetlet.2013.01.005
日期:2013.3
Azahomosteroid ring systems were synthesized through two-component coupling of γ,δ-unsaturated Fischer carbene complexes with o-alkynylheteroaryl carbonyl derivatives. The reaction occurs through the formation of azaisobenzofuran as transient intermediate; the latter undergoes a subsequent Diels–Alder cycloaddition reaction with in-built dienophile with high regio- and stereoselectivity.
叠氮类固醇环系统是通过γ,δ-不饱和Fischer卡宾配合物与邻炔基杂芳基羰基衍生物的两组分偶联而合成的。该反应通过形成氮杂异苯并呋喃作为过渡中间体而发生。后者随后与具有高度区域和立体选择性的内置亲二烯体进行随后的Diels-Alder环加成反应。