1'-binaphthalene (Neolephos), which permits the palladium-catalyzed selective carbonylation under mild conditions, providing a general preparation of functionalized 1,3-enynes in good-to-high yields with excellent chemoselectivities. Synthetic applications that showcase the possibilities of this novel methodology include an efficient one-potsynthesis of 4-aryl-4H-pyrans as well as the rapid construction of various
Synthesis of (E)-α-Ethynyl-α,β-unsaturated Esters from Allenyl Acetates Catalyzed by DABCO and Their Application to Sonogashira Cross-Coupling Reactions
作者:Hyun-Seok Kim、Doo-Sup Shin、Kwang-Moo Lee、Sang-Kyu Lee、Sang-Hyuk Kim、Phil-Ho Lee
DOI:10.5012/bkcs.2010.31.03.742
日期:2010.3.20
esters from another precursor without the use of (Z)-α-halo-α,β-unsaturated esters. As part of our continuing studies into the utility of allene groups, we report herein the preparation of the selective synthesis of (E)-α-ethynyl-α,β-unsaturated esters from allenyl acetates catalyzed by DABCO and their application to Sonogashira cross-coupling reaction (Scheme 1). First, various allenyl acetates were
Stereoselective DABCO-Catalyzed Synthesis of (<i>E</i>)-α-Ethynyl-α,β-Unsaturated Esters from Allenyl Acetates
作者:Yongsik Choe、Phil Ho Lee
DOI:10.1021/ol9001703
日期:2009.3.19
(E)-alpha-Ethynyl-alpha,beta-unsaturated esters were exclusively prepared in good to excellent yields from treatment of allenyl acetates with 10 mol % DABCO in DMF at room temperature.