Oxindole Synthesis by Direct Coupling of C sp 2H and C sp 3H Centers
作者:Yi-Xia Jia、E. Peter Kündig
DOI:10.1002/anie.200805652
日期:——
An sp2/sp3 get‐together: A novel and efficient method can be used to synthesize 3,3‐disubstitued oxindoles by the direct intramolecular oxidative coupling of an aryl CH and a CH center (see scheme; DMF=N,N‐dimethylformamide).
carbon-containing cyclobutane-1,3-diones using chiral phosphoric acid catalysis and commercially available oxidants was reported. According to the structure of the substrates, two optimized reaction conditions were developed to afford the corresponding chiral tetronic acid products in ≤93% and ≤95% ee values. This reaction offers the first catalytic asymmetric approach to chiral 5,5-disubstituted tetronic acid derivatives
首次报道了使用手性磷酸催化和市售氧化剂对含季碳环丁烷-1,3-二酮进行高度对映选择性拜耳-维利格氧化。根据底物的结构,开发了两种优化的反应条件,得到了相应的手性季酮酸产物,其ee值≤93%和≤95%。该反应为手性 5,5-二取代特窗酸衍生物提供了第一个催化不对称方法。(−)-vertinolide 的正式不对称合成和 plakinidone B 的首次催化不对称全合成证明了该方法的合成潜力。
Pd(II)-Catalyzed Direct Sulfonylation of Unactivated C(sp<sup>3</sup>)–H Bonds with Sodium Sulfinates
作者:Wei-Hao Rao、Bei-Bei Zhan、Kai Chen、Peng-Xiang Ling、Zhuo-Zhuo Zhang、Bing-Feng Shi
DOI:10.1021/acs.orglett.5b01634
日期:2015.7.17
A Pd(II)-catalyzed sulfonylation of unactivated C(sp(3))-H bonds with sodium arylsulfinates using an 8-aminoquinoline auxiliary is described. This reaction demonstrates excellent functional group tolerance with respect to both the caboxamide starting material and the sodium arylsulfinate coupling partner, affording a broad range of aryl alkyl sulfones. Moreover, the late-stage modification of complex molecules was achieved via this sulfonylation protocol.