描述了在氢借位催化下使用1°或2°醇对各种酮进行的烷基化。最初的研究集中在环丙酮与更高的1°醇(即大于MeOH)的α-烷基化反应上,导致形成α-支化产物。我们通过寻找其他底物来探索这种化学反应,使我们发现,二邻位取代的芳基酮也是特有的支架,其中Ph ∗(C 6 Me 5)酮是最佳选择。进一步的研究表明,该基序对于与2°醇形成β支链产物的烷基化至关重要,这也为研究非对映选择性和分子内氢借入过程提供了机会。
Alkylation and protonation of alkynyltrialkylborate salts-a new general method for the preparation of ketones
作者:Andrew Pelter、C. R. Harrison、D. Kirkpatrick
DOI:10.1039/c39730000544
日期:——
Terminal alkynes (R2CCH) may be converted into ketones (R2R3CHCOR1) by the alkylation or protonation of lithium lakynyltrialkylborate salts followed by oxidation, this being a general route to specifically substituted ketones and a major extension of alkyne chemistry.
末端炔烃(R 2 C CH)可以通过烷基三烷基硼酸锂盐的烷基化或质子化反应再转化为酮(R 2 R 3 CHCOR 1),这是通向特定取代的酮的一般路线,也是炔烃化学的主要延伸。
Pelter,A. et al., Journal of the Chemical Society. Perkin transactions I, 1976, p. 2419 - 2428
作者:Pelter,A. et al.
DOI:——
日期:——
Hydrogen borrowing catalysis using 1° and 2° alcohols: Investigation and scope leading to α and β branched products
作者:James R. Frost、Choon Boon Cheong、Wasim M. Akhtar、Dimitri F.J. Caputo、Kirsten E. Christensen、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1016/j.tet.2021.132051
日期:2021.4
variety of ketonesusing 1° or 2° alcohols under hydrogen borrowing catalysis is described. Initial research focused on the α-alkylation of cyclopropyl ketones with higher 1° alcohols (i.e. larger than MeOH), leading to the formation of α-branchedproducts. Our search for additional substrates with which to explore this chemistry led us to discover that di-ortho-substituted aryl ketones were also privileged
描述了在氢借位催化下使用1°或2°醇对各种酮进行的烷基化。最初的研究集中在环丙酮与更高的1°醇(即大于MeOH)的α-烷基化反应上,导致形成α-支化产物。我们通过寻找其他底物来探索这种化学反应,使我们发现,二邻位取代的芳基酮也是特有的支架,其中Ph ∗(C 6 Me 5)酮是最佳选择。进一步的研究表明,该基序对于与2°醇形成β支链产物的烷基化至关重要,这也为研究非对映选择性和分子内氢借入过程提供了机会。