Synthesis of α-Substituted Enoximes with Nucleophiles via Nitrosoallenes
摘要:
This paper reports nitrosoallene-mediated synthesis of alpha-substituted enoximes. Nucleophilic substitution of nitrosoallenes, a novel chemical species prepared from allenyl N-hydroxysulfonamides, afforded alpha-functionalized enoximes. Introduction of various nucleophiles proceeded smoothly to form C-N, C-O, C-S, C-F, and C-C bonds in the presence of azodicarboxylates.
This paper reports nitrosoallene-mediated synthesis of alpha-substituted enoximes. Nucleophilic substitution of nitrosoallenes, a novel chemical species prepared from allenyl N-hydroxysulfonamides, afforded alpha-functionalized enoximes. Introduction of various nucleophiles proceeded smoothly to form C-N, C-O, C-S, C-F, and C-C bonds in the presence of azodicarboxylates.
Gold-Catalyzed Synthesis of 3-Pyrrolidinones and Nitrones from N-Sulfonyl Hydroxylamines via Oxygen-Transfer Redox and 1,3-Sulfonyl Migration
作者:Hyun-Suk Yeom、Eunsu So、Seunghoon Shin
DOI:10.1002/chem.201002863
日期:2011.2.7
Golden touch: Gold‐catalyzed reaction of N‐sulfonyl hydroxylamines with terminal alkyne led to 3‐pyrrolidinones by means of an oygen‐transfer redox reaction. This protocol constitutes a direct method for forming α‐amino carbonyl compounds. In sharp contrast, those with internal alkynes underwent 1,3‐sulfonyl migration leading to 3‐sulfonyl cyclic nitrones.