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 %).
Conversion of <i>N</i>-Benzyloxycarbonylamino- and <i>N</i>-Tosylamino-Benzyl Phenylsulfones by Green Strecker Reactions to α-Aminobenzyl Nitriles Using Potassium Hexacyanoferrate(II)
作者:Xiaochun Hu、Rongzhi Li、Zheng Li
DOI:10.3184/174751914x14030207593683
日期:2014.7
α-aminobenzyl nitriles has been achieved by eco-friendly Strecker reactions using potassium hexacyanoferrate(II) as a cyanide source, benzoyl chloride as a promoter, and potassium hydroxide as a base. The protocol has the advantages of using a nontoxic, nonvolatile and inexpensive cyanatingagent, employing a simple work-up procedure and producing high yields.
使用六氰基高铁酸钾 (II) 作为氰化物源,通过生态友好的 Strecker 反应实现了由 N-苄氧基羰基氨基和 N-甲苯磺基氨基-苄基苯砜原位生成的醛亚胺氰化为相应的 N-保护的 α-氨基苄基腈,苯甲酰氯作为促进剂,氢氧化钾作为碱。该协议的优点是使用无毒、非挥发性和廉价的氰化剂,采用简单的处理程序,产量高。
The first catalytic Sakurai reaction of N-alkoxycarbonylamino sulfones with allyltrimethylsilane
作者:Thierry Ollevier、Zhiya Li
DOI:10.1039/b613331b
日期:——
We report the firstcatalytic Sakurai reaction of N-alkoxycarbonylamino sulfones with allylsilanes. The allylation reaction of N-alkoxycarbonylamino phenylsulfones with allyltrimethylsilane proceeded smoothly with low catalyst loading of bismuth triflate (2.0 mol%) to afford the corresponding protected homoallylic amines in moderate to very good yields (up to 96%).
α-Amido sulphones as useful intermediates in the preparation of<i>C</i>-chiral α-aminophosphonates and α-aminophosphonic acids
作者:Joseph D. Gbubele、Tomasz Misiaszek、Miłosz Siczek、Tomasz K. Olszewski
DOI:10.1039/d3ob00924f
日期:——
α-Amido sulphones have been used as useful starting materials in the preparation of C-chiral α-aminophosphonates and α-aminophosphonic acids. The developed methodology is based on a one-pot, base-catalysed in situ generation of an imine intermediate followed by addition of a phosphorus nucleophile. The presented protocol is simple and effective and can be applied to a variety of structurally diverse