Divalent Activation in Temporary Phosphate Tethers: Highly Selective Cuprate Displacement Reactions
作者:Alan Whitehead、James P. McParland、Paul R. Hanson
DOI:10.1021/ol061756r
日期:2006.10.1
of a readily derived pseudo-C(2)-symmetric monocyclic phosphate via highly diastereoselective anti-S(N)2' allylic displacement reactions is reported. This method utilizes of a wide variety of zinc-derived organocuprates to afford E-1,2-syn-configured phosphate acid building blocks. Extension of this protocol to unsymmetric monocyclic phosphates exclusively yields 1,2-anti-configured products. Within
据报道,通过高度非对映选择性的抗S(N)2'烯丙基置换反应易于衍生的伪C(2)-对称单环磷酸酯的不对称。该方法利用了多种源自锌的有机铜酸盐,以提供E-1,2-syn-构型的磷酸构建单元。将该方案扩展至不对称单环磷酸酯,仅产生1,2-抗构型产品。在这项研究中,立体电子因素,再加上烯丙基应变,最终决定了区域和非对映选择性铜酸盐的反应,进一步证实了将有机铜添加到烯丙基酯中的Corey机制。[反应:看文字]