Umpolung Strategy for Arene C−H Etherification Leading to Functionalized Chromanes Enabled by I(III)
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‐Ligated Hypervalent Iodine Reagents
作者:Myriam Mikhael、Wentao Guo、Dean J. Tantillo、Sarah E. Wengryniuk
DOI:10.1002/adsc.202100809
日期:2021.11.9
The direct formation of aryl C−O bonds via the intramolecular dehydrogenativecoupling of a C−H bond and a pendant alcohol represents a powerful synthetic transformation. Herein, we report a method for intramolecular arene C−H etherification via an umpoled alcohol cyclization mediated by an I(III) N-HVI reagent. This approach provides access to functionalized chromane scaffolds from primary, secondary
A Method To Accomplish a 1,4-Addition Reaction of Bulky Nucleophiles to Enones and Subsequent Formation of Reactive Enolates
作者:Anthony D. William、Yuichi Kobayashi
DOI:10.1021/ol010071i
日期:2001.6.1
[reaction: see text] BF(3)-promoted 1,4-addition of bulky aryl groups to alpha-iodo enones, prepared from the parent enones, afforded beta-aryl-alpha-iodo ketones. Subsequent reaction with EtMgBr furnished the magnesium enolates, which upon reactions with ClP(O)(OEt)(2) and aldehydes gave enol phosphates and aldols, respectively. This method was applied successfully to a synthesis of Delta(1)-tran
enones was followed by the reaction with ClP(O)(OEt)2 to afford the corresponding enol phosphates in moderate to good yields. The scope of this method was examined with sterically hindered or electronically biased enones and/or reagents. This activation of boron enolates was successfully applied to the synthesis of the methyl ether of Δ9-tetrahydrocannabinol.