串联还原-还原胺化反应已用于合成3,4-二氢-2 H -1,4-苯并恶嗪和1-乙酰基-1,2,3,4-四氢喹喔啉。苯并恶嗪环闭合所需要的硝基酮是通过(A)用烯丙基卤化物将2-硝基苯酚衍生的阴离子烷基化,或(B)在2-氟-1-硝基苯上进行烯丙基醇盐的亲核芳族取代,然后进行臭氧分解来制备的。喹喔啉的前体是通过将2-硝基乙酰苯胺的阴离子与烯丙基卤化物烷基化,然后进行臭氧分解来制备的。然后在甲醇中使用5%钯碳催化硝基酮的加氢反应,然后通过还原-还原胺化顺序得到目标杂环。该ñ通过在还原之前添加5-10当量的甲醛水溶液,可以轻松制备两个环系统的α-甲基衍生物。通过色谱法纯化后,高产率地分离出二氢苯并恶嗪。以相似的方式分离四氢喹喔啉,并在两个氮原子上具有不同的官能度。
Pd-Catalyzed Regioselective Intramolecular Allylic C–H Amination of 1,1-Disubstituted Alkenyl Amines
作者:Young Ho Kim、Dong Bin Kim、Su San Jang、So Won Youn
DOI:10.1021/acs.joc.2c00781
日期:2022.6.3
Pd-Catalyzed intramolecular allylic C–H amination of 1,1-disubstituted alkenyl amines with various allylic tethers (X = O, NMs, CH2) was developed. This process allows for the divergent synthesis of 1,3-X,N-heterocycles through a regioselective allylic C–H cleavage and π-allylpalladium formation. Particularly noteworthy is the use of substrates containing a labile allylic moiety and new simple catalytic
Simple Tandem Olefin Isomerization/Intramolecular Hydroamination of Alkenyl Amines with Various Allylic Tethers
作者:Young Ho Kim、Dong Bin Kim、So Won Youn
DOI:10.1021/acs.joc.2c01640
日期:2022.9.2
A simple and efficient AgOTf-promoted tandem olefin isomerization/intramolecular hydroamination of 1,1-disubstituted alkenyl amines has been developed. This one-pot process represents a facile and attractive route for the synthesis of diverse 2-alkyl-substituted 1,3-X,N-heterocycles through chemo- and regioselective C(sp3)–N bondformation with atom economy. Advantages such as the operationally simple