Vinyl selenones react with sodium methanethiolate in methanol to give the product of conjugate addition and subsequent displacement of the selenonyl group. On the contrary, the same reaction carried out with alkoxide anions affords the conjugate addition products in excellent yields. These β-alkoxy alkylphenylselenones are stable compounds which can react in several ways with loss of the selenonyl
Optimization of Grignard ring-opening of α-brominated dioxolanes for the preparation of β-hydroxy-protected vinyl ethers by a three-step one-pot procedure
Aliphatic, cyclic, and aromatic benzoate-protected γ-hydroxy enol ethers were prepared from α-brominated dioxolanes by a three-step reaction procedure and a one-pot protocol involving Grignardreagent formation, ring-opening, and final benzoate protection. Additionally, tert-butyldiphenylsilyl, acetate, and 4,4′-dimethoxytrityl were also successfully used as alternative protecting groups.
Highly Regioselective Internal Heck Arylation of Hydroxyalkyl Vinyl Ethers by Aryl Halides in Water
作者:Riina K. Arvela、Serena Pasquini、Mats Larhed
DOI:10.1021/jo0705768
日期:2007.8.1
ethylene glycol vinyl ether with arylhalides was shown to be possible in water without the need for any halide scavengers or ionic liquid additives. This presents, to our knowledge, the first case of water being utilized in the selective arylation of electron-rich olefins. Resulting α-products were hydrolyzed and isolated as corresponding acetophenones in good to excellent yields when using aryl bromides
Facile synthesis of enol ethers by cleavage of α-bromoacetals and α-bromoketals mediated by SmI2
作者:Heui Sul Park、Seong Ho Kim、Min Young Park、Yong Hae Kim
DOI:10.1016/s0040-4039(01)00547-0
日期:2001.5
alpha -Bromocyclicacetals, alpha -bromocyclicketals and alpha -bromocyclicthioketals, derived from cyclic and acyclic ketones and aldehydes, reacted with samarium diiodide at -78 degreesC in THF to furnish the corresponding enol ethers or thioenol ethers containing hydroxy or thiol moieties in high yields. (C) 2001 Published by Elsevier Science Ltd.
McClelland, Robert A.; Watada, Brian; Lew, Calvin S. Q., Journal of the Chemical Society. Perkin transactions II, 1993, # 10, p. 1723 - 1728
作者:McClelland, Robert A.、Watada, Brian、Lew, Calvin S. Q.