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Abstract
A convenient, novel synthesis of (E)-1-phenyl-1-alkenes based on (Z)-1-bromo-1-alkenylboronate esters will be developed. α-Bromo-
(Z)-1-alkenylboronate esters readily available from literature procedures will undergo a reaction with phenyllithium in tetrahydrofuran to provide the corresponding “ate” complexes. These “ate” complexes will then undergo intramolecular nucleophilic substitution reactions to provide the corresponding (E)-1-alkenylboronate esters containing a phenyl moiety which upon protonolysis with acetic acid will afford the corresponding (E)-1-phenyl-1-alkenes. All (E)-1-phenyl-1-alkenes were characterized by PMR and CMR spectral data successfully.
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Copyright (c) 2023 Narayan G. Bhat, Percal Lopez
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
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- N.G. Bhat, C. Martinez and J. De Los Santos, A novel synthesis of ßketosilanes via Organoboranes, Tetrahedron Lett., 41, 6541 (2000); https://doi.org/10.1016/S0040-4039(00)01088-1
References
H.C. Brown, N.G. Bhat and V. Somayaji, Organoboranes. 30. Convenient Procedures for the Synthesis of Alkyl- and Alkenylboronic
Acids and Esters, Organometallics, 2, 1311 (1983); https://doi.org/10.1021/om50004a008
D.S. Matteson and D. Majumdar, Homologation of Boronic Esters to α-Chloro Boronic Esters, Organometallics, 2, 1529 (1983); https://doi.org/10.1021/om50005a008
D.J.S. Tsai, P.K. Jesthi and D.S. Matteson, Diastereoselection in Reactions of Pinanediol Dichloromethaneboronate, Organometallics,
,1543 (1983); https://doi.org/10.1021/om50005a010
H.C. Brown, N.R. De Lue, Y. Yamamoto, K. Maruyama, T. Kasahara, S. Murahashi and A. Sonoda, Organoboranes. 23. Reaction of Organolithium and Grignard Reagents with α-Bromoalkylboronate Esters. A Convenient, Essentially Quantitative Procedure for the Synthesis of tertiary Alkyl-, Benzyl-, Propargyl-, and Stereospecific Allylboranes, J. Org. Chem., 42, 4088 (1977); https://doi.org/10.1021/jo00445a022
M.W. Rathke, E. Chao and G. Wu, The Preparation and Reactions of Esters of Dichloromethaneboronic Acid, J. Organomet. Chem., 122, 145 (1976); https://doi.org/10.1016/S0022-328X(00)80606-3
H.C. Brown and T. Imai, Organoboranes. 37. Synthesis and Properties of (Z)-1-Alkenylboronic Esters, Organometallics, 3, 1293 (1984); https://doi.org/10.1021/om00087a013
H.C. Brown, T. Imai and N.G. Bhat, Vinylic organoboranes. 7. Stereoselective synthesis of (E)-(1-Substituted-1-alkenyl)boronic Esters
by the Nucleophilic Substitution of (Z)-(1-bromo-1-alkenyl)boronic Esters with Organolithium or Grignard Reagents. Isolation and Oxidation to Ketones, J. Org. Chem., 51, 5277 (1986); https://doi.org/10.1021/jo00376a042
H.C. Brown and R. Soundararajan, A Convenient Synthesis Of β,γ- Unsaturated Ketones via Allylation of Z-1-Halo-1-alkenyl-1,3,2- dioxaborolane, Tetrahedron Lett., 35, 6963 (1994); https://doi.org/10.1016/0040-4039(94)88199-5
N.G. Bhat, C. Martinez and J. De Los Santos, A novel synthesis of ßketosilanes via Organoboranes, Tetrahedron Lett., 41, 6541 (2000); https://doi.org/10.1016/S0040-4039(00)01088-1