Iron-catalyzed regio- and stereoselective addition of acid chlorides to alkynes
作者:Bo Wang、Shihua Wang、Pinhua Li、Lei Wang
DOI:10.1039/c0cc01182g
日期:——
An iron-catalyzed regio- and stereoselective addition of acid chlorides to alkynes has been described. The reaction utilizes an inexpensive iron catalyst system and it is suitable for the formation of a variety of bifunctional molecules. This is an inexpensive, regio-, stereoselective and atom-economical approach to beta-chloro-alpha,beta-unsaturated ketones from simple and readily available starting
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.
The regioselectivity of the conversion of 1,3-diketones into beta-chloroenones can be changed by the appropriate choice of the reagent: reaction with ''Vilsmeier's reagent'' prepared from POCl3 and dimethylformamide or treatment of the diketone with the oxalyl chloride in the presence of dimethylformamide.
ALBEROLA, ANGEL;ANDRES, JOSE M.;GONZALEZ, ALFONSO;PEDROSA, RAFAEL;PRADANO+, SYNTH. COMMUN., 20,(1990) N6, C. 2537-2547
作者:ALBEROLA, ANGEL、ANDRES, JOSE M.、GONZALEZ, ALFONSO、PEDROSA, RAFAEL、PRADANO+