使用Grubbs的第二代催化剂形成意外的重排产物:由二烯前体生成的2-烯丙基-3,4-二氢-2 H -1,4-苯并噻嗪
摘要:
将亚化学计量的Grubbs第二代催化剂应用于底物N-烯丙基-N- [2-(烯丙基硫烷基)苯基] -4-甲基苯磺酰胺,得到闭环化合物6-[(4-甲基苯基)磺酰基]- 5,6-二氢-2 H -1,6-苯并噻唑啉,以及意想不到的2-烯丙基-4-[(4-甲基苯基)磺酰基] -3,4-二氢-2 H -1,4-苯并噻嗪。在类似的亚砜上使用相似的条件,得到了预期的产物6-[[(4-甲基苯基)磺酰基] -5,6-二氢-2 H -1,6-苯并噻唑啉-1-氧化物,表明该硫化物正在发挥在这种新颖转变中的关键作用。此外,使用N-烯丙基-4-甲基-N-{2-[((2-甲基-2-丙烯基)硫烷基]苯基}-苯磺酰胺在相同反应中得到2-(2-甲基-2-丙烯基)-3,4-二氢-2 H -1,4-苯并噻嗪。
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