New Aspects in the Stereoselective Ethynylation of β-C-Glycoside Aldehydes. Application to the Synthesis of an Ambruticin Fragment
作者:Véronique Michelet、Kouacou Adiey、Suzelle Tanier、Gilles Dujardin、Jean-Pierre Genêt
DOI:10.1002/ejoc.200300255
日期:2003.8
Stereoselective ethynylation of functionalized β-C-glycosyl aldehydes has been achieved with various organometallic alkynes. The diastereoselectivity is highly dependent on the organometallic alkyne and on the functionalization on the C-6 position of the glycoside. The stereoselective reaction conducted with ester-functionalized aldehyde, followed by Mitsunobu reaction and two Pd-catalyzed regio- stereo-
已经用各种有机金属炔实现了官能化 β-C-糖基醛的立体选择性乙炔化。非对映选择性高度依赖于有机金属炔和糖苷 C-6 位的官能化。用酯官能化的醛进行立体选择性反应,然后是 Mitsunobu 反应和两个 Pd 催化的区域立体选择性和对映选择性烷基化,提供了氨溴索的“西部”部分。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)