Fe(III) Halides as Effective Catalysts in Carbon−Carbon Bond Formation: Synthesis of 1,5-Dihalo-1,4-dienes, α,β-Unsaturated Ketones, and Cyclic Ethers
作者:Pedro O. Miranda、David D. Díaz、Juan I. Padrón、Miguel A. Ramírez、Víctor S. Martín
DOI:10.1021/jo048410j
日期:2005.1.1
homopropargylic alcohols were used, a Prins-typecyclization occurred yielding 2-alkyl-4-halo-5,6-dihydro-2H-pyrans. In addition, anhydrous ferric halides are also shown to be excellent catalysts for the standard Prins cyclization with homoallylic alcohols. Isolation of an intermediate acetal, calculations, and alkyne hydration studies provide substantiation of a proposed mechanism.
Novel and Efficient Method for The Synthesis of 4-Chloro-5, 6-Dihydro Pyran Derivatives using Lewis Acidic Chloroaluminate Ionic Liquids
作者:N. Raju、K. Rajasekhar、J. Babu、B. Rao
DOI:10.13005/ojc/320459
日期:2016.8.25
The reaction of aldehydes/ketones with homopropargylic alcohols in the presence of 1-n-Butyl-3-methylimidazolium chloroaluminate [bmim]Cl·AlCl3 (N = 0.56-0.67) ionic liquid generates the 4-chloro-5,6-dihydro-2H-pyran derivatives in excellent yield and in short reaction times.
A New Catalytic Prins Cyclization Leading to Oxa- and Azacycles
作者:Pedro O. Miranda、Rubén M. Carballo、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/ol802593u
日期:2009.1.15
A new Prins cyclization process that builds up one carbon−carbon bond, one heteroatom-carbon bond, and one halogen-carbon bond, (in an oxa- and azacycle) relies on an iron catalyst system formed from Fe(acac)3 and trimethylsilyl halide. The method displays a broad substrate scope and is economical, environmentally friendly, and experimentally simple. This catalytic method permits the construction of
Thirupathaiah; Rao, G. Venkateshwar, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2008, vol. 47, # 11, p. 1762 - 1765
作者:Thirupathaiah、Rao, G. Venkateshwar
DOI:——
日期:——
Antiproliferative activity of 4-chloro-5,6-dihydro-2H-pyrans. Part 2: Enhancement of drug cytotoxicity
作者:Leticia G. León、Pedro O. Miranda、Víctor S. Martín、Juan I. Padrón、José M. Padrón
DOI:10.1016/j.bmcl.2007.03.045
日期:2007.6
The Prins reaction was the basis to synthesize functionalized alkyl chlorodihydropyran derivatives. The inexpensive, stable, and environmentally friendly FeCl3 promotes the cyclization. The method represents an efficient and regioselective manner to obtain in a single step chlorovinyl-TMS oxacycles. The in vitro antiproliferative activities of the compounds were examined in the human solid tumor cell lines A2780 (ovarian cancer), SW1573 (non-small cell lung cancer), and WiDr (colon cancer). Overall, the results show an enhancement in the cytotoxicity exhibited by the new analogs when compared to their parental compounds. (C) 2007 Elsevier Ltd. All rights reserved.