C (sp3) -H 键的直接和可控氧化的发展非常重要。在此,公开了在无金属反应条件下碘催化的(芳基)(杂芳基)甲烷到(芳基)(杂芳基)甲醇的可控氧化。在二甲亚砜存在下,由碘/甲硅烷基氯和 HI 作为添加剂组成的催化体系选择性地氧化 C (sp3) -H 键,而不会过度氧化成相应的酮。以良好的收率获得了治疗上重要的芳基杂芳基甲醇衍生物。初步机理研究证明氧气的主要来源是DMSO。
A thermal O-to-C [1,3]-rearrangement of α-hydroxy acid derived enol ethers was achieved under mild conditions. The 2-aminothiophenol protection of carboxylic acids facilitates formation of the [1,3] precursor and its thermalrearrangement via stabilization of a radical intermediate. Experimental and theoretical evidence for dissociative radical pair formation, its captodative stability via aminothiophenol
A removable functional group strategy for regiodivergent Wittig rearrangement products
作者:Md Nirshad Alam、Lakshmi K. M.、Pradip Maity
DOI:10.1039/c8ob02221f
日期:——
[1,2] and [2,3] Wittig rearrangements are competing reaction pathways, often leading to uncontrollable product distribution. We employ a single removable functional group to fulfill the dual role of attaining a reversible [2,3] and stabilizing radical intermediate for the [1,2] path to obtain both the Wittig products selectively for a broad range of substrates.