Copper-Catalyzed [3+2] Cycloaddition and Interrupted Fischer Indolization to Prepare Polycyclic Furo[2,3-b]indolines from <i>N</i>
-Aryl Isatin Nitrones and Methylenecyclopropanes
作者:Si-Yi Wu、Wei-Li Chen、Xiao-Pan Ma、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1002/adsc.201801327
日期:2019.3.5
3‐b]indolines containing a cyclopropane ring have been prepared in moderate yields with high diastereoselectivityfrom N‐aryl isatin nitrones and methylenecyclopropanes using a copper‐catalyzed [3+2] cycloaddition and subsequent interrupted Fischer indolization strategy under mild reaction conditions. The obtained furo[2,3‐b]indolines were easily converted to piperidinone‐fused furo[2,3‐b]indolines by
Synthesis of Spirooxindole‐Benzo[d]oxazoles and Dihydrobenzofurans through Cycloaddition and Rearrangement of
<i>N</i>
‐Vinyl Nitrones and Arynes
作者:Hao Yuan、Dong‐Liu Lu、Cui Liang、Dong‐Liang Mo
DOI:10.1002/adsc.202101372
日期:2022.4.12
[3+2] cycloaddition and selective rearrangement of N-vinyl oxindole nitrones and arynes under transition metal-free conditions. Experimental results showed that the substituent on the nitrone N-vinyl group controlled the [1,3]- or [3,3]-rearrangement of their cycloadduct owing to its steric effect. The present method features broad substrate scope, good functional group tolerance, controllable [1,3]-