Base-Free Selective <i>O</i>
-Arylation and Sequential [3,3]-Rearrangement of Amidoximes with Diaryliodonium Salts: Synthesis of 2-Substituted Benzoxazoles
作者:Wei-Min Shi、Xiao-Hua Li、Cui Liang、Dong-Liang Mo
DOI:10.1002/adsc.201700906
日期:2017.12.11
of functionalized 2‐substituted benzoxazoles can be prepared in good yields from amidoximes and diaryliodonium salts by selective O‐arylation and sequential [3,3]‐rearrangement under metal‐free conditions. O‐arylation of amidoximes was promoted by 3 Å molecule sieves in the absence of a base and a sequential TFA‐mediated [3,3]‐rearrangement was used to synthesize 2‐substituted benzoxazoles. Both of
在无金属条件下,可以通过选择性O芳基化和顺序[3,3]重排,从ox胺肟和二芳基碘鎓盐中以高收率制备各种功能化的2-取代苯并恶唑。ø偕胺肟的-arylation用3埃分子筛在不存在碱的和促进连续TFA介导的,使用[3,3] -rearrangement以合成2-取代的苯并恶唑。两者的ø -芳基产品和重排产物用宽范围敏感的官能团,如酯,醛,硝基,乙烯基,胺和酰胺基团除了卤化物的兼容。分两步以克规模制备了带有双苯并恶唑的双齿N-配体。