The Use of Phosphine Ligands to Control the Regiochemistry of Pd-Catalyzed Hydrostannations of 1-Alkynes: Synthesis of (E)-1-Tributylstannyl-1-alkenes
摘要:
The regiochemistry of palladium-catalyzed hydrostannations of terminal alkynes is dramatically influenced by ligand effects. Use of phosphines such as Cy(3)P, t-Bu(2)PCH(2)t-Bu, and t-Bu(3)P provides (E)-1-tributylstannyl-1-alkenes with regioselectivities up to > 99:< 1 for substrates where the commonly used Ph(3)P shows much lower regioselectivities.
Heterobimetallic Control of Regioselectivity in Alkyne Hydrostannylation: Divergent Syntheses of α- and (<i>E</i>)<i>-</i>β<i>-</i>Vinylstannanes via Cooperative Sn–H Bond Activation
作者:Li-Jie Cheng、Neal P. Mankad
DOI:10.1021/jacs.9b00068
日期:2019.2.27
terminal alkynesunder mild conditions, with Markovnikov/anti-Markovnikov selectivity controlled by the Cu/M pairing. By using the MeIMesCu-FeCp(CO)2 catalyst, a variety of α-vinylstannanes were produced from simple alkyl-substituted alkynes and Bu3SnH in high yield and good regioselectivity; these products are challenging to access under mononuclear metal-catalyzed hydrostannylation conditions. In addition
KALIVRETENOS, A.;STILLE, J. K.;HEGEDUS, L. S., J. ORG. CHEM., 56,(1991) N, C. 2883-2894
作者:KALIVRETENOS, A.、STILLE, J. K.、HEGEDUS, L. S.
DOI:——
日期:——
The Use of Phosphine Ligands to Control the Regiochemistry of Pd-Catalyzed Hydrostannations of 1-Alkynes: Synthesis of (<i>E</i>)-1-Tributylstannyl-1-alkenes
作者:Alla Darwish、Adam Lang、Thomas Kim、J. Michael Chong
DOI:10.1021/ol702982x
日期:2008.3.1
The regiochemistry of palladium-catalyzed hydrostannations of terminal alkynes is dramatically influenced by ligand effects. Use of phosphines such as Cy(3)P, t-Bu(2)PCH(2)t-Bu, and t-Bu(3)P provides (E)-1-tributylstannyl-1-alkenes with regioselectivities up to > 99:< 1 for substrates where the commonly used Ph(3)P shows much lower regioselectivities.