method to access functionalized aliphatic acidesters using silylperoxyacetals as alkyl radical precursors with a terminal ester moiety is described. The reaction proceeds via the in situ generation and subsequent functionalization of alkyl radicals, affording synthetically valuable aliphatic acid derivatives. A novel strategy for the synthesis of hydroxy acid derivatives via a C−O bond formation process
描述了使用甲硅烷基过氧缩醛作为具有末端酯部分的烷基自由基前体获得官能化脂肪酸酯的催化方法。该反应通过烷基自由基的原位生成和随后的官能化进行,得到具有合成价值的脂肪酸衍生物。还开发了一种通过 CO 键形成过程合成羟基酸衍生物的新策略。
Stereocontrolled Synthesis of Spiro[n.2]alkenes by Ring Contraction of Fused-Cyclobutanols
作者:Kiyosei Takasu、Yuuki Nagamoto、Yoshiji Takemoto
DOI:10.1002/chem.201000930
日期:——
An unusual ring‐contraction rearrangement to give spirocyclopropanes from fused cyclobutanols (see scheme) has been developed. It is found that the strain energy of the substrates derived from an additional fused ring and the stereoelectronic effect of the migrating σ bond are important factors. It is noteworthy that the rearrangement proceeds in a stereospecific manner. Moreover, the method provides
of ketones is a fundamental yet unresolved transformation in organic chemistry. Herein we report a new catalytic methodology able to construct α-allyl ketones via defluorinative allylation of silylenolethers in a regio-, diastereo- and enantioselective manner. The protocol leverages the unique features of the fluorine atom to simultaneously act as a leaving group and to activate the fluorophilic nucleophile