Eu(fod)3-Catalyzed rearrangement of allylic esters possessing a chelating site. Application to enediyne synthesis
作者:Wei-Min Dai、Mavis Yuk Ha Lee
DOI:10.1016/s0040-4039(99)00276-2
日期:1999.3
A number of 1,2-dialkynyl-3-alkyl or 3-aryl allylicesters underwent a facile Eu(fod)3-catalyzed rearrangement at 20–132 °C to give exclusively cis-enediynes. The esters capable of forming a chelate with Eu(III) exhibited a remarkably enhanced reactivity; the C3 aryl group facilitated the rearrangement as well.
Regioselective Synthesis of Acyclic <i>cis</i>-Enediynes via an Acid-Catalyzed Rearrangement of 1,2-Dialkynylallyl Alcohols. Syntheses, Computational Calculations, and Mechanism
作者:Wei-Min Dai、Jinlong Wu、Kin Chiu Fong、Mavis Yuk Ha Lee、Chi Wai Lau
DOI:10.1021/jo982476v
日期:1999.7.1
2-diyn-2-propen-1-ols 1 possessing a C3-aryl group in the presence of water, alcohols, or thiols. Reactivity of allyl alcohols and regio- and cis/trans diastereoselectivity of the allylic migration were examined. In the presence of (±)-10-camphorsulfonic acid (CSA), the parent allyl alcohol 5 and the C3-methyl-substituted 9 failed to give enediynes, whereas the C3-aryl-substituted 12 and 29 underwent the allylic rearrangement