Development and Application of a Direct Vinyl Lithiation of <i>cis</i>-Stilbene and a Directed Vinyl Lithiation of an Unsymmetrical <i>cis</i>-Stilbene
作者:Juliet Cotter、Anne-Marie L. Hogan、Donal F. O'Shea
DOI:10.1021/ol070239l
日期:2007.4.1
1-lithio-1,2-diphenylethene undergoes an in situ Z-to-E isomerization, and subsequent reaction with electrophiles results in an efficient stereoselective synthesis of trisubstituted alkenes. A directed vinyl lithiation of the unsymmetrical cis-stilbene 2-styryl-phenyl-carbamic acid tert-butyl ester can be achieved regioselectively, thereby expanding this methodology for further synthetic applications in
[反应:请参见文本]使用s-BuLi在-25°C的THF中可以轻松实现顺式-苯乙烯的乙烯基去质子化。和随后与亲电试剂的反应导致三取代烯烃的有效的立体选择性合成。可以区域选择性地实现不对称的顺式-苯乙烯-2-苯乙烯基-苯基-氨基甲酸叔丁酯的定向乙烯基锂化,从而将该方法扩展用于吲哚化学中的进一步合成应用。