作者:Kenji Egusa、Koichi Fukase、Shoichi Kusumoto
DOI:10.1055/s-1997-3258
日期:1997.6
The 4-azido-3-chlorobenzyl (Cl-Azb) group was readily introduced to hydroxy functions by the use of a crystalline reagent, 4-azido-3-chlorobenzyl bromide, which was prepared from commercially available 2-chloro-4-methylaniline in two steps. Cl-Azb ethers have improved acid stability as compared to the corresponding parent 4-azidobenzyl (Azb) ether. Cl-Azb ethers were stable to direct 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) oxidation, but were cleaved smoothly by DDQ oxidation after conversion to the corresponding iminophosphorane derivative.
4-叠氮-3-氯苄基(Cl-Azb)基团可以通过使用一种结晶试剂4-叠氮-3-氯苄基溴化物,方便地引入到羟基功能上。这种试剂是通过两步从市售的2-氯-4-甲基苯胺制备的。与相应的母体4-叠氮苄基(Azb)醚相比,Cl-Azb 醚具有更好的酸稳定性。Cl-Azb 醚对直接的2,3-二氯-5,6-二氰苯醌(DDQ)氧化反应稳定,但在转化为相应的亚磷酸胺衍生物后,能被DDQ氧化平滑断裂。