Electrochemical Cleavage of Sulfonamides: An Efficient and Tunable Strategy to Prevent β-Fragmentation and Epimerization
摘要:
The electrochemical reduction of sensitive sulfonamides is described. The addition of a benzoyl group on the nitrogen atom facilitates the reductive cleavage of sulfonamides preventing beta-fragmentation and epimerization. This strategy was successfully applied to the cyclopropylamine and to alpha-amino stannanes.
Oxaziridine-mediated enantioselective aminohydroxylation of styrenes catalyzed by copper(II) bis(oxazoline) complexes
作者:David J. Michaelis、Kevin S. Williamson、Tehshik P. Yoon
DOI:10.1016/j.tet.2009.03.012
日期:2009.6
oxaziridine-mediated enantioselective aminohydroxylation of olefins catalyzed by a chiral copper(II) bis(oxazoline) complex. A variety of styrenic olefins undergo efficient aminohydroxylation with excellent regioselectivity and synthetically useful levels of enantioselectivity (up to 84% ee). The reaction can be conducted on multi-gram scale with as little as 2 mol % of the copper(II) catalyst. Hydrolysis
我们报告了由手性铜 (II) 双 (恶唑啉) 配合物催化的恶氮丙啶介导的烯烃的对映选择性氨基羟基化。各种苯乙烯烯烃经过有效的氨基羟基化,具有出色的区域选择性和合成有用的对映选择性水平(高达 84% ee)。该反应可以在多克规模上进行,使用少至 2 mol% 的铜 (II) 催化剂。所得 1,3-恶唑啉在酸性条件下水解产生N-磺酰基氨基醇,可通过重结晶纯化以提供非常高水平的对映选择性。
Electrochemical Cleavage of Sulfonamides: An Efficient and Tunable Strategy to Prevent β-Fragmentation and Epimerization
作者:Pierre Viaud、Vincent Coeffard、Christine Thobie-Gautier、Isabelle Beaudet、Nicolas Galland、Jean-Paul Quintard、Erwan Le Grognec
DOI:10.1021/ol300003f
日期:2012.2.3
The electrochemical reduction of sensitive sulfonamides is described. The addition of a benzoyl group on the nitrogen atom facilitates the reductive cleavage of sulfonamides preventing beta-fragmentation and epimerization. This strategy was successfully applied to the cyclopropylamine and to alpha-amino stannanes.
Mild Electrochemical Deprotection ofN-PhenylsulfonylN-Substituted Amines Derived from (R)-Phenylglycinol
作者:Vincent Coeffard、Christine Thobie-Gautier、Isabelle Beaudet、Erwan Le Grognec、Jean-Paul Quintard