Synthesis and reactivity of β-phenylselanyl α-oxoesters
摘要:
beta-Phenylselanyl alpha-oxoesters 2 were prepared by N-phenylselanyl morpholine treatment of alpha-oxoesters 1, oxidized into beta-unsaturated alpha-oxoesters 5 and subjected to the Wittig-Horner olefination. The diethyl (1-phenylselanylalkyl)maleates 6 have led, after [2,3]sigmatropic rearrangement of the corresponding selenoxides, to the diethyl 3-alkylidene-2-hydroxysuccinates 7. The 2-(t-butoxycarbonylamino)-3-alkylidenesuccinates 8 were prepared in a similar way. The decomposition of halo-adducts derived from compounds 6 has allowed the synthesis of the diethyl 3-alkylidene-2-halosuccinates 9 and 10. (C) 1997 Elsevier Science Ltd.
Synthesis of <font>α</font>-Azido Ketones and Esters Using Recyclable Hypervalent Iodine Reagent
作者:Vikas N. Telvekar、Hemlata V. Patile
DOI:10.1080/00397910903531888
日期:2010.12.21
A simple and mild method for the preparation of α-azido ketones and esters using hypervalentiodinereagent, 4,4′-bis-(dichloroiodo)-biphenyl, and sodium azide in 1,4-dioxane is discussed. Advantages of this system are easy workup, recyclablereagent, and moderate to good yields.
Reaction of α-iminomethylene amino esters with mono- and bidentate nucleophiles: a straightforward route to 2-amino-1H-5-imidazolones
作者:Montserrat Heras、Montserrat Ventura、Anthony Linden、José M Villalgordo
DOI:10.1016/s0040-4020(01)00330-1
日期:2001.5
The reaction between α-iminomethylene amino esters with different mono- and bidentate nucleophiles has been studied. It has been shown that the reactions with primary and secondary amines as monodentate nucleophiles afford 2-aminoimidazolones efficiently under very mild conditions. Judicious selection of the primary amines employed can modulate the regioselectivity. Analogous reactions employing bidentate