More than twenty examples illustrate the recently developed oxidoketone-alkynone-fragmentation, whereby α,β-epoxy-ketones are cleaved under mild conditions with p-toluenesulfonyl-hydrazine to give acetylenic ketones or aldehydes.
Sulfate Radical Anions (SO<sub>4</sub><sup>•</sup><sup>-</sup>) as Donor of Atomic Oxygen in Anionic Transannular, Self-Terminating, Oxidative Radical Cyclizations
作者:Uta Wille
DOI:10.1021/ol006527y
日期:2000.11.1
anionic, transannular, self-terminating, oxidativeradical cyclization in the reactions with the ten-membered cycloalkyne 1 and the cycloalkynone 7, yielding the bicyclic ketones 5 and 6 or the alpha,beta-epoxy ketones 8 and 9, respectively. In these reactions SO(4)(*)(-) acts as an oxygen transfer reagent and can thus be considered as a donor of atomicoxygen in solution.
Self-terminating, oxidative radical cyclizations of medium-sized cycloalkynones with inorganic and organic oxygen-centered radicals of type XO˙: the reaction pathway depends on the nature of X
作者:Uta Wille、Christian Jargstorff
DOI:10.1039/b201672a
日期:2002.4.9
The reaction of various inorganic and organic oxygen-centered radicals of type XO˙ with cyclodec-5-ynone 6 can be used as a mechanistic probe to study the ease with which X˙ acts as a leaving group in self-terminating, oxidative radical cyclizations. It was observed that when X˙ has good leaving ability the reaction leads to formation of the bicyclic epoxy ketones 13 and 14, whereas in the other cases
The recently discovered novel concept of self-terminating, oxidative radical cyclizations, through which alkynes can be converted into carbonyl compounds under very mild reaction conditions usingO-centered inorganic and organicradicals as oxidants, is described.
描述了最近发现的自终止氧化自由基环化的新概念,通过该概念,炔烃可以在非常温和的反应条件下使用以 O 为中心的无机和有机自由基作为氧化剂转化为羰基化合物。
Hanack,M. et al., Chemische Berichte, 1972, vol. 105, p. 421 - 433