Asymmetric Aza-Morita-Baylis-Hillman Reactions of Alkyl Vinyl Ketones with N-Protected Imines or In Situ Generated N-Protected Imines
作者:Xiao-Yang Guan、Yin Wei、Min Shi
DOI:10.1002/ejoc.201000496
日期:2010.7
DABCO-catalyzed aza-MBH reactions of N-Boc imines with MVK and EVK have been thoroughly investigated in the paper. The asymmetric version of this aza-MBH reaction was also systematically investigated by using a chiral amine or a chiral phosphane catalyst. It was found that most of the N-protected imines are suitable substrates under the mild reaction conditions and are able to give the corresponding
DABCO 催化的 N-Boc 亚胺与 MVK 和 EVK 的 aza-MBH 反应已在论文中进行了彻底的研究。还通过使用手性胺或手性磷烷催化剂系统地研究了这种 aza-MBH 反应的不对称形式。发现大多数 N 保护的亚胺在温和的反应条件下是合适的底物,并且能够以中等产率和高 ee 值得到相应的加合物。TQO-或LB1-催化的N-保护的α-酰氨基烷基苯砜或α-酰氨基烷基对甲苯基砜与MVK的氮杂-MBH反应可以很好地进行,这为获得高对映选择性氮杂-MBH加合物提供了一种简便直接的途径.
InBr<sub>3</sub>: A Versatile Catalyst for the Different Types of Friedel−Crafts Reactions
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1021/jo9014613
日期:2009.10.16
Mild and efficient InBr3-catalyzed Friedel−Crafts alkylation of heteroaromatic or electron-rich aromatic compounds with α-amido sulfones at room temperature in CH2Cl2 has been developed. The products undergo further Friedel−Crafts alkylation with heteroaromatic or electron-rich aromatic compounds leading to unsymmetrical or bis-symmetrical triaryl methanes in good yield. α-Amido sulfones are employed
Bismuth Triflate-Catalyzed Addition of Allylsilanes to N-Alkoxycarbonylamino Sulfones: Convenient Access to 3-Cbz-Protected Cyclohexenylamines
作者:Thierry Ollevier、Zhiya Li
DOI:10.1002/adsc.200900710
日期:2009.12
Bismuth triflate was found to be an efficient catalyst in the Sakurai reaction of allyltrimethylsilanes with N-alkoxycarbonylaminosulfones. The reaction proceeded smoothly with a low catalyst loading of Bi(OTf)3⋅4 H2O (2–5 mol%) to afford the corresponding protected homoallylic amines in very good yields (up to 96%). A sequential allylation reaction followed by ring-closing metathesis delivers 6–8
Bismuth triflate was found to be an efficient catalyst in the Mannich-typereaction of silylenolates with N-alkoxycarbonylamino sulfones. The reaction proceeded smoothly with a low catalyst loading of bismuth triflate (0.5–1.0 mol %) to afford the corresponding protected β-aminocarbonyl compound in very good yields (up to 96 %).
Efficient Synthesis of N-Carbamoylpropargylamines from α-Amido Sulfones Using Dimethylalkynylaluminum Reagents
作者:Sang-Hyeup Lee、Ji-Hoon Lee
DOI:10.1055/s-0041-1737763
日期:2022.5
reagents derived from terminal alkynes and trimethylaluminum underwent addition to various N-activated α-amidosulfones to produce the corresponding alkynylamines in moderate to excellent yields. The optimized protocol avoids the preparation and isolation of relatively unstable N-activated imines that are generated in situfrom their corresponding, stable, N-activated α-amidosulfones. This methodology