Sulfonium ylides derived from 2-hydroxy-benzoquinones: crystal and molecular structure and their one-step conversion into Mannich bases by amine N-oxides
作者:Thomas Rosenau、Kurt Mereiter、Christian Jäger、Peter Schmid、Paul Kosma
DOI:10.1016/j.tet.2004.05.015
日期:2004.6
with DMSO/Ac2O produced dimethylsulfonium ylides, of which crystal structures as well as solid and liquid state NMR spectra were recorded. The ylides react with tertiary methylamine N-oxides in a one-pot, multi-step process to 3-methylamino-substituted benzoquinones. The mechanism starts with a deoxygenative deprotonation of the amine N-oxides, followed by a formal electrophilic displacement of DMSO
2-羟基-对-苯并醌与DMSO / Ac 2 O的反应生成了二甲基基化物,记录了其晶体结构以及固态和液态NMR光谱。所述一化物在一个一锅多步过程中与叔甲胺N-氧化物反应生成3-甲基氨基取代的苯醌。其机理始于胺N-氧化物的脱氧去质子化,然后是生成的碳-亚胺离子对DMSO的正式亲电置换。