2-芳基环己烷-1,3-二酮和2-芳基环戊烷-1,3-二酮可以通过简单的两步、一锅法转化为2-芳基-3-叠氮基环烷-2-en-1-酮。这些叠氮化物可以在催化Rh 2 (O 2 CC 7 H 15 ) 4的作用下顺利环化为咔唑酮和吲哚酮。虽然 3-叠氮基-2-苯基环庚-2-en-1-酮可以很容易地从 2-苯基环庚烷-1,3-二酮制备,但相比之下,Rh 催化的环化反应优先于吲哚生成氮丙啶。机理和 DFT 研究补充了综合工作。
Enantioselective Synthesis of Spiroindenes by Enol‐Directed Rhodium(III)‐Catalyzed CH Functionalization and Spiroannulation
作者:Suresh Reddy Chidipudi、David J. Burns、Imtiaz Khan、Hon Wai Lam
DOI:10.1002/anie.201507029
日期:2015.11.16
rhodium complexes promote highly enantioselective enol‐directedC(sp2)‐Hfunctionalization and oxidative annulation with alkynes to give spiroindenes containing all‐carbon quaternary stereocenters. High selectivity between two possible directing groups, as well as control of the direction of rotation in the isomerization of an O‐bound rhodium enolate into the C‐bound isomer, appear to be critical for high