introducing a propargyl group in aromatic bioactive small molecules has been developed. This method features propargylation of aromatic groups using a cationic propargyl hexacarbonyl complex in the presence of cesium carbonate, and decomplexation of the resultant cobalt complexes using 2,2,6,6-tetramethylpiperidine 1-oxonium tetrafluoroborate. These reactions proceed under mild conditions, and thus are
Access to 2,6-Dipropargylated BODIPYs as “Clickable” Congeners of Pyrromethene-567 Dye: Photostability and Synthetic Versatility
作者:Clara Uriel、Ana M. Gómez、Enrique García Martínez de la Hidalga、Jorge Bañuelos、Inmaculada Garcia-Moreno、J. Cristobal López
DOI:10.1021/acs.orglett.1c02380
日期:2021.9.3
6-dipropargyl-1,3,5,7-tetramethyl BODIPYs can be efficiently prepared by a Nicholas reaction/decomplexation protocol from 1,3,5,7-tetramethyl BODIPYs. The title compounds, which improve the BODIPY photostability by retaining their inherent photophysical and photochemical properties, can be engaged in efficient copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) “click-type” reactions with azido derivatives
Synthesis of Dicarbonyl(η<sup>4</sup>-tricarbonylcobaltacyclopentadiene)cobalt Complexes from Co<sub>2</sub>(CO)<sub>8</sub>. A General Route to Intermediates in Cobalt Carbonyl Mediated Alkyne Trimerization
作者:R. John Baxter、Graham R. Knox、Peter L. Pauson、Mark D. Spicer
DOI:10.1021/om980544y
日期:1999.1.1
cobaltacyclopentadiene complexes, derived from cobaltcarbonyl and two alkyne molecules and long believed to be intermediates in cyclotrimerization as well as in the formation of the (three-alkyne-derived) “flyover” complexes, can be isolated in selected cases if the mono(alkyne)−Co2(CO)6 complexes are treated at room temperature with just 1 equiv of alkyne in the presence of trimethylamine N-oxide. The complex (PhCCHCMeCMe)Co2(CO)5
Synthesis of [Co<sub>2</sub>(µ-PPh<sub>2</sub>C<sub>3</sub>H<sub>4</sub>)(µ-PPh<sub>2</sub>)(CO)<sub>4</sub>]; its reactions with P(OMe)<sub>3</sub>and with alkynes
作者:Andrew J. M. Caffyn、Martin J. Mays、Gregory A. Solan、Gráinne Conole、Antonio Tiripicchio
DOI:10.1039/dt9930002345
日期:——
The bis(phosphido)-bridged complex [Co2(µ-PPh2)2(CO)6]1 undergoes an insertion reaction of allene into one of the phosphido bridges, to give the new ligand-bridged dinuclear cobalt complex [Co2(µ-PPh2C3H4)(µ-PPh2(CO)4]2 in high yield. Complex 2 reacts with P(OMe)3 to give the monosubstituted derivative [Co2(µ-PPh2C3H4)(µ-PPh2)(CO)3P(OMe)3}]3 in which substitution has occurred at the allyl-co-ordinated
双(磷基)桥连的配合物[Co 2(µ-PPh 2)2(CO)6 ] 1经历了异戊二烯插入一个磷桥中的插入反应,得到了新的配体桥连的双核钴配合物[Co 2(µ-PPh 2 C 3 H 4)(µ-PPh 2(CO)4 ] 2高收率。络合物2与P(OMe)3反应生成单取代衍生物[Co 2(µ-PPh 2 C 3 H 4)(µ-PPh 2)(CO)3P(OMe)3 }] 3,其中取代发生在烯丙基配位的钴原子上。配合物2还与炔烃RC CH(R CH 2 OH,Me或H)反应,该炔烃与CO分子一起插入剩余的磷桥中,从而生成[CO 2(µ-PPh 2 C 3 H 4)µ -PPh 2 C(O)CHCR}(CO)3 ](R = CH 2 OH 4a,Me 4b或H 4c)。在MeC CH得到4b的情况下,第二种异构体[Co 2(µ-PPh 2 C3 ħ 4)μ-PPH 2 C(O)CMeCH}(CO)
Alkyne Ligation Handles: Propargylation of Hydroxyl, Sulfhydryl, Amino, and Carboxyl Groups via the Nicholas Reaction
作者:Sarah M. Wells、John C. Widen、Daniel A. Harki、Kay M. Brummond
DOI:10.1021/acs.orglett.6b02088
日期:2016.9.16
The Nicholas reaction has been applied to the installation of alkyne ligation handles. Acid-promoted propargylation of hydroxyl, sulfhydryl, amino, and carboxyl groups using dicobalt hexacarbonyl-stabilized propargylium ions is reported. This method is useful for introduction of propargyl groups into base-sensitive molecules, thereby expanding the toolbox of methods for the incorporation of alkynes