Lithiation-electrophilic trapping of N-sulfonyl-activated ethylene aziridines
作者:Jianhui Huang、Stephen P. Moore、Peter O'Brien、Adrian C. Whitwood、John Gilday
DOI:10.1039/b815957b
日期:——
A detailed study on the lithiation-electrophilic trapping of N-sulfonyl ethylene aziridines is described. The optimum results required use of a N-2,4,6-tri-iso-propylbenzenesulfonyl activating group and lithiation using 3 equiv. of s-BuLi–PMDETA for 1 minute before addition of the electrophile. In situ trapping with Me3SiCl was also successful. Electrophilic trapping with aldehydes provided a stereoselective
Dimerization and Isomerization Reactions of α-Lithiated Terminal Aziridines
作者:David M. Hodgson、Philip G. Humphreys、Steven M. Miles、Christopher A. J. Brierley、John G. Ward
DOI:10.1021/jo701901t
日期:2007.12.1
The scope of dimerization and isomerization reactions of α-lithiated terminal aziridines is detailed. Regio- and stereoselective deprotonation of simple terminal aziridines with lithium 2,2,6,6-tetramethylpiperidide (LTMP) or lithium dicyclohexylamide (LiNCy2) generates trans-α-lithiated terminal aziridines. These latter species can then undergo dimerization or isomerization reactions depending on
Generations and Reactions of<i>N</i>-(<i>t</i>-Butylsulfonyl)aziridinyllithiums Using Microreactors
作者:Aiichiro Nagaki、Eiji Takizawa、Jun-ichi Yoshida
DOI:10.1246/cl.2009.1060
日期:2009.11.5
by the reaction of N-Bus-2-phenylaziridine with n-BuLi in a microflow system at -28 °C, although much lower temperatures such as —78 °C are needed for batch reactors. Subsequent reactions with various electrophiles gave the corresponding α-substituted N-Bus-2-phenylaziridines. Deprotonation of N-Bus-aziridine with s-BuLi was also achieved by using a microflow system at —78 °C, and the reaction of the
N-叔丁基磺酰基(Bus)-α-苯基氮丙啶基锂通过 N-Bus-2-苯基氮丙啶与正丁基锂在 -28 °C 的微流系统中反应有效生成,尽管温度低得多,例如 -78 °C需要间歇式反应器。随后与各种亲电试剂反应得到相应的 α-取代 N-Bus-2-苯基氮丙啶。N-Bus-氮丙啶与 s-BuLi 的去质子化也是通过使用微流系统在 -78 °C 下实现的,所得 N-Bus-氮丙啶基锂与亲电试剂反应得到取代的 N-Bus-氮丙啶。
Dimerization of Lithiated Terminal Aziridines
作者:David M. Hodgson、Steven M. Miles
DOI:10.1002/anie.200503303
日期:2006.1.30
SYNTHETIC PROCESSES FOR THE PRODUCTION OF 1-((3S,4R)-4-(2,6-DIFLUORO-4-METHOXYPHENYL)-2-OXOPYRROLIDIN-3-YL)-3-PHENYLUREA
申请人:BRISTOL-MYERS SQUIBB COMPANY
公开号:US20210395200A1
公开(公告)日:2021-12-23
Highly efficient processes are provided for preparing key intermediates in the synthesis of compounds (I). The process are broadly applicable and can provide selected components having a variety of substituents. Some intermediates are claimed.