6-Exo-spiro (Alkoxycarbonylamino)methyl Radical Cyclization: Highly Regio- and Stereoselective Synthesis of (−)-Sibirine
作者:Masato Koreeda、Yamin Wang、Liming Zhang
DOI:10.1021/ol026671e
日期:2002.9.1
[reaction: see text] The (methoxycarbonylamino)methyl radical can be readily generated from its PhSe precursor and undergoes preferential 6-exo-spiro cyclization when PhSO(2) is attached at the distal alkene carbon. This property was applied to the synthesis of the racemic and optically active spirocyclic alkaloid sibirine.
[反应:见正文](Phoxy(2))连接在远端烯烃碳上时,可以很容易地从其PhSe前体生成(甲氧基羰基氨基)甲基,并进行优先的6-外-螺环化。该性质用于外消旋和旋光性螺环生物碱西比林的合成。