overall yield from O-methylnaphthazarin. Highlights of the synthetic work include an Ullmann coupling and a possibly biomimetic oxidative spirocyclization for the introduction of the naphthalene ketal as well as the use of a retro-Diels-Alder reaction to unmask the reactive enone moiety in the naphthoquinone bisepoxide ring system. A novel highly bulky chiral binaphthol ligand was developed for a boron-mediated
An Aluminum Ate Base: Its Design, Structure, Function, and Reaction Mechanism
作者:Hiroshi Naka、Masanobu Uchiyama、Yotaro Matsumoto、Andrew E. H. Wheatley、Mary McPartlin、James V. Morey、Yoshinori Kondo
DOI:10.1021/ja064601n
日期:2007.2.1
base and aromatic, followed by deprotonative formation of the functionalized aromatic aluminum compound. Deprotonation by the TMP ligand rather than the isobutyl ligand was suggested and reasoned by means of spectroscopic and theoretical study. The remarkable regioselectivity of the ortho alumination reaction was explained by a coordinative approximation effect between the functional groups and the counter
A new reagent system consisting of NaIO4/KI/NaCl in aq AcOH has been found to be effective in iodinating a variety of activated aromatic substrates via in situ-generated iodinemonochloride, to furnish iodoaromatics in excellent yields. This iodination procedure has been applied successfully for a cost-effective synthesis of 3,3′-diaminobenzidine, a key intermediate for preparing proton conducting
已发现由NaIO 4 / KI / NaCl在AcOH水溶液中组成的新试剂系统可有效地通过原位生成的一氯化碘来碘化各种活化的芳香族底物,从而以优异的产率提供碘代芳烃。该碘化方法已成功地用于高成本效益的3,3'-二氨基联苯胺的合成,这是制备燃料电池应用的质子传导膜的关键中间体,具有高收率和99.7%的纯度。
Synthesis of (Thio)Furan-Fused Phospholes via Phosphonation Cyclization and a Base-Promoted Phospha-Friedel–Crafts Reaction
strategy for synthesizing ladder (thio)furan-fused phospholes via intermolecular phosphonation cyclization and a base-promoted phospha-Friedel–Crafts reaction under mild conditions. The starting substrates are readily available phosphinic acids and easy-to-handle alkynes. The details of the reaction mechanism were further rationalized using theoretical calculations. This protocol can be widely applied to
REGIOSELECTIVE OXYIODINATION OF AROMATIC COMPOUNDS USING POTASSIUM IODIDE AND OXONE®*
作者:N. Narender、P. Srinivasu、S. J. Kulkarni、K. V. Raghavan
DOI:10.1081/scc-120006002
日期:2002.1
ABSTRACT A highly efficient, simple, mild and regioselectivemethod for oxyiodination of aromatic compounds is reported. The electrophilic substitution of iodine generated in situ from KI as an iodine source and oxone® as an oxidant for the first time. *IICT Communication No. 4786
摘要报道了一种高效、简单、温和和区域选择性的芳族化合物氧碘化方法。首次从 KI 作为碘源和 oxone® 作为氧化剂原位产生的碘的亲电取代。*IICT 通讯第 4786 号