Asymmetric Synthesis of Chiral Oxazolines by Organocatalytic Cyclization of α-Aryl Isocyanoesters with Aldehydes
作者:Liu-Zhu Gong、Meng-Xia Xue、Chang Guo
DOI:10.1055/s-0029-1217549
日期:2009.8
A cinchona alkaloid derivative catalyzed the asymmetric formal [3+2] cycloaddition of α-aryl isocyanoesters with aldehydes, affording highly substituted 2-oxazolines with good stereoselectivities of up to 18:1 dr and 90% ee.
一种金鸡纳生物碱衍生物催化了δ-芳基异氰酸酯与醛的不对称形式[3+2]环加成反应,得到了高度取代的 2-恶唑啉,其立体选择性高达 18:1 dr 和 90% ee。
A New Family of Cinchona-Derived Amino Phosphine Precatalysts: Application to the Highly Enantio- and Diastereoselective Silver-Catalyzed Isocyanoacetate Aldol Reaction
作者:Filippo Sladojevich、Andrea Trabocchi、Antonio Guarna、Darren J. Dixon
DOI:10.1021/ja110534g
日期:2011.2.16
developed. In combination with Ag(I) salts, these amino-phosphines performed as effective cooperative Brønsted base/Lewis acid catalysts in the asymmetric aldolreaction of isocyanoacetate nucleophiles. Under optimal conditions, high diastereoselectivities (up to 98%) and enantioselectivities (up to 98%) were obtained.