Oxidative formylation and chloromethylation in Vilsmeier reactions of O- and S-heterocyclic ketones
作者:Paul R. Giles、Charles M. Marson
DOI:10.1016/s0040-4020(01)86387-0
日期:1991.1
The action of DMF-POCl3 at 20 °C on tetrahydro-4H-pyran-4-one, tetrahydro-4H-thiopyran-4-one, chroman-4-one, and thiochroman-4-one affords the corresponding β-chlorovinylaldehydes. However, with excess DMF-POCl3 at 100 °C, chroman-4-one affords 3-(chloromethyl)chromone, and thiochromanone gives 3-formylthiochromone. Mechanistic rationalisations are provided.
Efficient Synthesis of 4- and 5-Substituted 2-Aminopyrimidines by Coupling of β-Chlorovinyl Aldehydes and Guanidines
作者:Anna S. Komendantova、Alexander V. Komkov、Yulia A. Volkova、Igor V. Zavarzin
DOI:10.1002/ejoc.201700737
日期:2017.8.10
A general, practical and simple synthesis of functionalized 2-aminopyrimidines starting from β-chlorovinyl aldehydes and amidines is reported. In the presence of potassium carbonate, various ketones have been efficiently incorporated into the pyrimidine derivatives by two-step sequence involving the Vilsmeier-Haack reaction followed by the condensation with guanidines. The protocol is distinguished
Reactions of hydrazones derived from oxamic acid thiohydrazides
作者:Yulia A. Volkova、Elena I. Chernoburova、Albina S. Petrova、Alexander A. Shtil、Igor V. Zavarzin
DOI:10.1080/10426507.2016.1250759
日期:2017.2.1
ABSTRACT This brief review describe the recent advances in using oxamic acid thiohydrazides as precursors for the formation of hydrazones intermediates from natural and synthetic compounds bearing a carbonyl group. These intermediates undergo a variety of synthetically useful transformations, which include nucleophilic addition and 6π-electrocyclic reactions to generate new heterocycles.
Herein, we report a C3 and C1 coupling approach between vinyl 1,3-dithiane derivatives and alkynylsilanes for the construction of highly substituted conjugated dienes. Through the regioselective dual 1,3-sulfur migration process, this method enabled the synthesis of a wide range of highly substituted (E)-1,3-dienes stereoselectively in moderate to high yields, which provided one alternative way to synthesize
在此,我们报道了乙烯基1,3-二噻烷衍生物和炔基硅烷之间的C 3和C 1偶联方法,用于构建高度取代的共轭二烯。通过区域选择性双1,3-硫迁移过程,该方法能够以中等到高产率立体选择性合成多种高度取代的( E )-1,3-二烯,为合成相应的共轭化合物提供了一种替代方法。二烯酮。
含氮大环类化合物及其制备方法和医药用途
申请人:[en]THE NATIONAL INSTITUTES OF PHARMACEUTICAL R & D CO., LTD;[zh]中国医药研究开发中心有限公司