Efficient synthesis of organic thioacetates in water
作者:F. Olivito、P. Costanzo、M. L. Di Gioia、M. Nardi、Oliverio M.、A. Procopio
DOI:10.1039/c8ob01896k
日期:——
Thioacetates as precursors of thiols are interesting starting points for synthesizing other organosulfur compounds. Herein, we propose a simple, efficient and fast method to obtain organic thioacetates using water as a solvent. Taking into account the great attention that has been paid toward environmentally friendly synthetic procedures in the past decades, we prove the role and the strength of the
Preparation of Enantioenriched Alkylcarbastannatranes via Nucleophilic Inversion of Alkyl Mesylates for Use in Stereospecific Cross-Coupling Reactions
作者:Glenn Ralph、Mark R. Biscoe
DOI:10.1021/acs.organomet.9b00467
日期:2019.10.28
We report the preparation of enantioenriched secondary alkylcarbastannatranes via a stereoinvertive SN2 reaction of enantioenriched alkyl mesylates and carbastannatranyl anion equivalents. Using this process, enantioenriched secondary alcohols may be converted into highly enantioenriched alkylcarbastannatranes, which are useful in stereospecific cross-coupling reactions.
我们报告了通过对映体富集的烷基甲磺酸盐和碳原子化炔基阴离子等价物的立体转化S N 2反应制备对映体富集的仲烷基氨基甲酸酯。使用该方法,可以将对映体富集的仲醇转化为高度对映体富集的烷基碳黄烷烃,其可用于立体有择的交叉偶联反应中。
Regioselective Alkylation of Lithium Dienediolates of α,β-Unsaturated Carboxylic Acids
作者:Eva M. Brun、Salvador Gil、Ramón Mestres、Margarita Parra
DOI:10.1055/s-2000-6323
日期:——
Lithium carboxylic acids dienediolates are regioselectively alkylated at the α-carbon by reaction with tosylates derived from both primary and secondary alcohols. Both regio- and diastereoselectivity are improved when compared with those obtained in the corresponding alkylation with alkyl halides.
Scope and Utility of a New Soluble Copper Catalyst [CuBr−LiSPh−LiBr−THF]: A Comparison with Other Copper Catalysts in Their Ability to Couple One Equivalent of a Grignard Reagent with an Alkyl Sulfonate
作者:Dennis H. Burns、Jeffrey D. Miller、Ho-Kit Chan、Michael O. Delaney
DOI:10.1021/ja963944q
日期:1997.3.1
THF at 0 °C furnished a new soluble copper catalyst that was highly efficient at coupling primary, secondary, tertiary, aryl, vinyl, and allylic Grignard reagents to primary tosylates and primary Grignard reagents to secondary tosylates and mesylates, all with the use of only 1 equiv of Grignard reagent. The new catalyst was shown to be much more reactive than copper catalysts CuBr and Li2CuCl4 and more
A New Convenient Friedel-Crafts Alkylation of Aromatic Compounds with Secondary Alcohol Methanesulfonates in the Presence of Scandium(III)Trifluoromethanesulfonate or Trifluoromethanesulfonic Acid as the Catalyst
作者:Hiyoshizo Kotsuki、Takeshi Ohishi、Motoshi Inoue、Tomoyuki Kojima
DOI:10.1055/s-1999-3436
日期:1999.4
Scandium(III) triflate and triflic acid were both found to be efficient catalysts for the Friedel-Crafts alkylation of aromatic compounds using methanesulfonates derived from secondary alcohols as alkylating agents.