作者:Yuting Leng、Fan Yang、Weiguo Zhu、Yangjie Wu、Xiang Li
DOI:10.1039/c1ob05223c
日期:——
Efficient and facile catalytic protocols for chlorination and ligand-directed ortho-acetoxylation of 2-arylbenzoxazoles have been developed. The chlorination is not a ligand-directed ortho-functionalization, but an electrophilic substitution process in the benzo ring of the benzoxazole moiety. Meanwhile, the acetoxylation exhibited high regioselectivity for the substrates containing a meta-substituent and occurred at the less sterically hindered ortho-C–H bond of the directing group.
针对 2-芳基苯并恶唑的氯化和配体定向正乙酰氧基化,我们开发出了高效、简便的催化方案。氯化反应不是配体定向的正官能化,而是苯并恶唑分子苯环上的亲电取代过程。同时,乙酰氧基化对含有元取代基的底物具有很高的区域选择性,并且发生在指导基团的立体阻碍较小的正交-C-H 键上。