Catalytic Asymmetric Amination of N-Nonsubstituted α-Alkoxycarbonyl Amides: Concise Enantioselective Synthesis of Mycestericin F and G
作者:Farouk Berhal、Sho Takechi、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/chem.201002874
日期:2011.2.7
requisite functionalities of the polar heads of sphingosines with the appropriate stereochemical arrangement. The rapid asymmetric assembly of these functional groups allowed a concise enantioselective synthetic route to sphingosines to be established with a broad flexibility towards derivative synthesis. These studies have culminated in an efficient catalytic enantioselective total synthesis of immunosuppressive
在试图探索三元不对称催化剂的含La的合成实用程序(NO 3)3 ⋅6H 2 O,酰胺类配体([R )- L1,和d -缬氨酸叔丁基酯H- d -Val-O吨卜,我们研究了官能化的N-未取代的α -烷氧基羰酰胺的催化,不对称胺化使用二-叔偶氮二羧酸丁酯作为亲电胺化试剂。高度官能化的环状N-未取代的α-烷氧基羰基酰胺可提供理想的胺化产物,其对映体过量高达96%,并具有适当的立体化学排列所需的鞘氨醇极性头官能团。这些官能团的快速不对称组装允许建立对鞘氨醇的简明的对映选择性合成途径,并且对衍生物合成具有广泛的灵活性。这些研究最终达到了免疫抑制真菌代谢物Mysestericin F(3a)和G(3b)的高效催化对映选择性全合成的目的。