Development of the Ireland−Claisen Rearrangement of Alkoxy- and Aryloxy-Substituted Allyl Glycinates
作者:James P. Tellam、David R. Carbery
DOI:10.1021/jo1017124
日期:2010.11.19
The Ireland−Claisenrearrangement of 3-alkoxy- and 3-aryloxy-substituted allyl glycinates is presented. This [3,3]-sigmatropic rearrangement route offers direct access to syn β-alkoxy and β-aryloxy α-amino acid systems. In particular, N,N-diboc glycine esters rearrange with excellent diastereoselectivities (dr > 25:1). The synthesis of substrates, rearrangement optimization, and a discussion of stereoselection
TFP as a ligand in Au(i)-catalyzed dihydropyran synthesis. Unprecedented rearrangement of dihydropyrans into cyclopentenones
作者:Eliška Matoušová、Aleš Růžička、Jiří Kuneš、Jarmila Králová、Milan Pour
DOI:10.1039/c1cc13525b
日期:——
Dihydropyrans have been prepared by the cyclisation of easily accessible propargyl vinyl ethers with (TFP)AuCl/AgBF4 as a catalyst in high yields. These compounds undergo acid-catalysed rearrangement into cyclopentenone derivatives.
A Robust and General Protocol for the Lewis-Base-Catalysed Reaction of Alcohols and Alkyl Propiolates
作者:David Tejedor、Sergio J. Álvarez-Méndez、Juan M. López-Soria、Víctor S. Martín、Fernando García-Tellado
DOI:10.1002/ejoc.201301303
日期:2014.1
This research was supported by the Spanish Ministerio de Economia y Competitividad (MICINN) and the European Regional Development Fund (CTQ2011-28417-C01-01 and CTQ2011-28417-C02-02). S. J. A.-M. thanks the Spanish Ministerio de Educacion y Ciencia (MEC) for an FPU grant.
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between tertiaryphosphines (triphenylphosphine and tributylphosphine) and alkyl acetylenecarboxylates, by alcohols (2,2,2-trichloroethanol, propargyl alcohol, and 4-(trifluoromethyl)-benzyl alcohol) leads to vinyltriphenylphosphonium salts, which undergo addition-elimination reaction to produce the corresponding O-vinyl