Electrophilic ipso-Iodocyclization of N-(4-Methylphenyl)propiolamides: Selective Synthesis of 8-Methyleneazaspiro[4,5]trienes
摘要:
[GRAPHICS]A novel and selective method for the synthesis of 8-methylenespiro[4,5]trienes via intramolecular electrophilic ipsoiodocyclization of N-(4-methylphenyl)propiolamides has been developed. In the presence of ICI or I-2, 8-methylene-1-azaspiro[4,5]trienes were selectively prepared from the electrophilic ipso-iodocyclization of N-(4-methylphenyl)propiolamides in moderate to good yields.
Direct Access to Bridged Polycyclic Skeletons by Merging Oxidative C–H Annulation and Cascade [4 + 2] Cycloaddition
作者:Yan He、Heng Wang、Li Xu、Deng-Yuan Li、Ji-Hong Ge、Da-Fu Feng、Wei Feng、Gang Zou、Pei-Nian Liu
DOI:10.1021/acs.orglett.1c03652
日期:2022.1.14
report a step-economic strategy for the direct synthesis of bridged polycyclic skeletons by merging oxidative C–H annulation and cascade cycloaddition. In the protocol, spiro[cyclopentane-1,3′-indoline]-2,4-dien-2′-ones were first synthesized by oxidative C–H annulation of ethylideneoxindoles with alkynes. Subsequent cascade [4 + 2] cycloaddition with dienophiles gave the bridged bicyclo[2.2.1]quinolin-2(1H)-ones