Copper-catalyzed cascade aminoalkynylation–oxidation of propargylic alcohols has been realized, sterospecifically providing an array of (Z)-2-amino conjugated enynals/enynones in good yields under mild conditions. This transformation involves a rare 1,3-alkynyl migration of propargylic alcohols and simultaneously forms C–C, C–N, and C═O bonds. Furthermore, (Z)-2-amino conjugated enynals were applied
A silver/DBU catalyst system was developed for the effective synthesis of cyclic carbonate and oxazolidinone from the reaction of CO2 with propargylicalcohols and propargylic amines, respectively,...
The combined catalyst system of silver acetate with a chiral Schiff base ligand achieved asymmetric carbondioxideincorporation into bispropargylic alcohols with desymmetrization to afford the corresponding cyclic carbonates with good-to-excellent enantiomeric excesses.
Isolation of a tricyclo[6,2,0,02,5]deca-1,3,5,7,9-pentaene
作者:Fumio Toda、Mitsuru Ohi
DOI:10.1039/c39750000506
日期:——
The compound (7), containing two cyclobutadiene rings, was isolated as blue needles by heating E,E-1,2-diphenyl-3,4-bis(t-butylphenylethynylmethylene)cyclobut-1-ene (5).
作者:Colin F. Lynch、Joseph W. Downey、Yongliang Zhang、Jacob M. Hooker、Mark D. Levin
DOI:10.1021/acs.orglett.3c02838
日期:2023.10.6
carbon of phenols. Our approach relies on the synthesis of a 1,5-dibromo-1,4-pentadiene precursor, which upon lithium–halogen exchange followed by treatment with carbonate esters results in a formal [5 + 1] cyclization to form the phenol product. Using this strategy, we have prepared 12 1-13C-labeled phenols, show proof-of-concept for the labeling of phenols with carbon-14, and demonstrate phenol synthesis