Synthesis of Azide-Alkyne Fragments for “Click” Chemical Applications. Part 2. Formation of Oligomers from Orthogonally Protected Chiral Trialkylsilylhomopropargyl Azides and Homopropargyl Alcohols
摘要:
A small library of chiral, beta(3)-substituted homopropargyl alcohols and chiral beta(3)-substituted trimethylsilylhomopropargyl azides were generated starting from natural L-amino acids. The free alkynes and azides were then coupled, using a Huisgen 1,3-dipolar cycloaddition, to provide chiral oligomeric 1,4-disubstituted-1,2,3-triazoles as potential peptidomimetic compounds. The work is an extension to the previous synthesis of racemic, orthogonally protected 1,4-disubstituted-1,2,3-triazoles from the corresponding alpha-substituted propargyl alcohols and alpha-substituted trialkylsilylpropargyl azides.
Brønsted Acid Catalyzed Asymmetric Propargylation of Aldehydes
作者:Pankaj Jain、Hao Wang、Kendall N. Houk、Jon C. Antilla
DOI:10.1002/anie.201107407
日期:2012.2.6
Which gets activated? A versatile and highly enantioselective chiral Brønstedacidcatalyzed method for the propargylation of aldehydes is described to provide a range of chiral homopropargylic alcohols. Computational studies support the belief that the chiral phosphoric acid activates the allenyl boronic acid pinacol ester reagent rather than the aldehyde.
Flexible Tetrahydropyran Synthesis from Homopropargylic Alcohols Using Sequential Pd–Au Catalysis
作者:Jungjoon Kim、Wook Jeong、Young Ho Rhee
DOI:10.1021/acs.orglett.6b03532
日期:2017.1.6
flexible synthetic method toward highly substituted tetrahydropyran is reported. The key transformation involves atom-efficient sequential metal catalysis consisting of Pd-catalyzed addition of homopropargylicalcohols to alkoxyallene and the subsequent gold(I)-catalyzed cycloisomerization. Notably, this method gives access to both 2,6-cis- and 2,6-trans-tetrahydropyrans possessing diverse substitution patterns
A Convergent Approach to Diverse Spiroethers through Stereoselective Trapping of Rhodium Carbenoids with Gold-Activated Alkynols
作者:Arianne C. Hunter、Steven C. Schlitzer、Joseph C. Stevens、Bilal Almutwalli、Indrajeet Sharma
DOI:10.1021/acs.joc.7b03196
日期:2018.3.2
A convergent approach for the stereoselective synthesis of diverse spiroethers is described. The reaction involves stereoselectivetrapping of diazo-derived rhodium carbenoids with gold-activated alkynols for the installation of spiro cores. The reaction has proven general with a range of readily accessible homopropargylic alcohols and diazo carbonyls to provide functionalized spiroether cores of bioactive