Efficient Preparation of β-Branched γ,δ-Unsaturated Esters through Copper-Catalyzed Allylic Alkylation of Ketene Silyl Acetal
作者:Hirohisa Ohmiya、Masaya Sawamura、Dong Li
DOI:10.1055/s-0031-1289712
日期:2012.5
Copper-catalyzed allylic alkylation of ketene silyl acetals proceeded with excellent γ-E-selectivity. Efficient α-to-γ chirality transfer with anti-selectivity occurred in the reaction of enantioenriched secondary allylic phosphates, affording enantioenriched β-branched γ,δ-unsaturated esters. The reaction was readily scalable and highly reliable in terms of product yield and stereoselectivities. γ
铜催化乙烯酮甲硅烷基缩醛的烯丙基烷基化反应具有出色的γ- E选择性。在对映体富集的仲烯丙基磷酸酯的反应中,发生了具有反选择性的高效α-γ手性转移,从而得到了对映体富集的β-支化γ,δ-不饱和酯。该反应在产物收率和立体选择性方面易于扩展并且高度可靠。 γ,δ-不饱和酯-铜-烯丙基烷基化-乙烯酮甲硅烷基缩醛-区域选择性