Selective Addition of Organolithium Reagents to BF<sub>2</sub>-Chelates of β-Ketoesters
作者:Bogdan Štefane
DOI:10.1021/ol100620j
日期:2010.7.2
A short, mild, and highly chemoselective addition of organolithiumreagents to a BF2 complex of 3-oxopropanoates has been developed. The methodology allows straightforward preparation of various 1,3-dioxa-BF2 complexes and subsequently leads to the formation of 1,3-diketones starting from the corresponding 3-oxopropanoates.
The structural criteria of hydrolytic stability in series of dioxaborine polymethine dyes
作者:Andrii O. Gerasov、Konstantin V. Zyabrev、Mykola P. Shandura、Yuriy P. Kovtun
DOI:10.1016/j.dyepig.2010.09.007
日期:2011.4
The structural criteria that affect stability to the alkaline hydrolysis of dioxaborine dyes were analyzed Dyes with different electron-donor and electron-withdrawing groups conjugated with dioxaborine cycle and also having some stem effects were analyzed For this purpose some new dioxaborine dyes were synthesized It was shown that electron-donor substituents unlike electron-withdrawing ones increase the hydrolytic stability of the dioxaborine dyes The possible way of the basic hydrolysis of dioxaborine dyes was suggested The products of the partial hydrolysis of the symmetrical dioxaborine dyes were first obtained (C) 2010 Elsevier Ltd All rights reserved
A new and a convenient route to enaminones and pyrazoles
作者:Bogdan Štefane、Slovenko Polanc
DOI:10.1039/b108524g
日期:2002.1.24
A new method has been developed for the regioselective preparation of enaminones and pyrazoles from 1,3-diketonatoboron difluorides. The reactions proceed smoothly under mild reaction conditions, producing enaminones and pyrazoles in high yields.