has been accomplished in the presence of a chiral N,N′‐dioxide/[Sc(OTf)3] complex (0.5–2 mol %), delivering the desired vicinal anti‐α‐iodo‐β‐amino carbonyl compounds regioselectively in high yields (up to 97 %) and with excellent diastereoselectivities (>99:1 d.r.) and enantioselectivities (up to 99 % ee). Enantiopure syn‐α‐iodo‐β‐amino products could also be obtained from the isomerization of particular
sulfinamide bisphosphine catalysts (Wei‐Phos) were developed. These could be easily prepared from commercially available starting materials. Wei‐Phos has shown good performance in the very challenging intermolecular cross‐Rauhut–Currier reactions of vinyl ketones and 3‐acyl acrylates or 2‐ene‐1,4‐diones, leading to the R‐C products in high yields with up to 99 % ee under 2.5–5 mol% catalyst loading. The highly
Diversity-Oriented Three-Component Reactions of Diazo Compounds with Anilines and 4-Oxo-Enoates
作者:Changcheng Jing、Dong Xing、Yu Qian、Taoda Shi、Yun Zhao、Wenhao Hu
DOI:10.1002/anie.201303987
日期:2013.8.26
Choosing a path: The title reaction can proceed through two different reaction pathways, and is controlled by the addition sequence of the substrates. Divergent polyfunctional products, pyrrolidines or linear α‐amino ester derivatives, are obtained in good yields and high diastereoselectivities.
The enantioselectiveintermolecular cross Rauhut-Currierreaction of acrolein with active olefins has been a long-standing challenge because of competitive MBH reaction and polymerization. Reported herein is a highly enantioselectiveintermolecular...
A TMG catalyzed, practical and efficient hydrophosphorylation of 4-oxo-enoates by diethyl or diphenyl phosphite has been described. This protocol allows a convenient access to a variety of enol phosphates under mild conditions in good yield with excellent stereoselectivity.