catalytic enantio- and diastereoselective nitro-Mannichreaction of α-amido sulfones in the mixed solvent of toluene/H2O has been realized using a phase-transfer catalyst (PTC) derived from cinchona alkaloids and N-benzotriazole. It performed well over a wide range of substrates to give the desired products in good yields (up to 94%) with excellent enantioselectivities (up to 99% ee) and diastereoselectivities
使用衍生自金鸡纳生物碱和N-苯并三唑的相转移催化剂(PTC)实现了α-酰胺基砜在甲苯/ H 2 O混合溶剂中的催化对映体和非对映体的硝基曼尼希反应。它在各种底物上均表现良好,以高收率(最高94%)提供所需的产品,并具有出色的对映选择性(最高99%ee)和非对映选择性(最高99:1)。
The dinuclear zinc catalyst 1a was found to catalyze the addition of nitroalkanes to carbamate-protected imines. This aza-Henryreaction proceeds with high enantioselectivity when various carbamate-protected imines are used. alpha,beta-Unsaturated imines proved to be a particularly useful class of substrate routinely giving the alpha-nitro amine products in high enantiomeric excess.
Asymmetric aza-Henry reaction of BOC-protected imines with zinc-FAM catalyst
作者:Nurzhan Beksultanova、Özdemir Doğan
DOI:10.1080/00397911.2024.2303054
日期:2024.3.3
Derivatives of ferrocenyl-substituted aziridinyl methanol (FAM) ligands were used with zinc metal for asymmetric aza-Henry (nitro-aldol) reaction of N-Boc protected imines with nitroalkanes. At opt...
作者:Chun-Jiang Wang、Xiu-Qin Dong、Zhi-Hai Zhang、Zhi-Yong Xue、Huai-Long Teng
DOI:10.1021/ja803538x
日期:2008.7.1
Highly anti-selective and enantioselective nitro-Mannich reactions have been achieved for a broad spectrum of substrates catalyzed by chiral bifunctional multiple hydrogen-bonding-donor amine-thioureas. Multiple hydrogen-bonding donors play a significant role in accelerating reactions and improving yields, diastereoselectivities, and enantioselectivities.