Highly Regioselective Synthesis of Substituted Pyrroles Utilizing Low-Valent Titanium Reagent
作者:Daqing Shi、Guolan Dou、Chunling Shi、Zhengyi Li、Shun-Jun Ji
DOI:10.1055/s-2007-990787
日期:2007.10
A short and efficientsynthesis of substituted pyrroles was accomplished in good yields via the novel coupling cyclization reaction of 1,3-diketones with imines promoted by low-valenttitaniumreagent. High regioselectivity was achieved and the structures of two of the products were confirmed by X-ray diffraction studies.
通过低价钛试剂促进的 1,3-二酮与亚胺的新型偶联环化反应,以良好的收率完成了取代吡咯的短而有效的合成。实现了高区域选择性,并且通过 X 射线衍射研究证实了两种产物的结构。
Axially Chiral Phosphine-Oxazoline Ligands in Silver(I)- Catalyzed Asymmetric Mannich Reaction of Aldimines with Trimethylsiloxyfuran
作者:Hong-Ping Deng、Yin Wei、Min Shi
DOI:10.1002/adsc.200900550
日期:2009.11
A new asymmetric catalytic system for the Mannichreaction of aldimines with trimethylsiloxyfuran is described. The combination of an axiallychiralphosphine-oxazolineligand (S)-2-[(R)-2′-(diphenylphosphino)-1,1′-binaphthyl-2-yl]-4-phenyl-4,5-dihydrooxazole with silver acetate and 2,2,2-trifluoroacetic acid is a very effective catalytic system in the asymmetricMannichreaction of various aldimines
A Novel Uncatalyzed Insertion Reaction of In Situ Formed Trichlorosilyl Cyanide with Imines: A Facile Silicon Mediated Synthesis of α-Aminonitriles
作者:Abdel-Aziz S. El-Ahl
DOI:10.1081/scc-120016363
日期:2003.1.4
Abstract The tetrachlorosilane-potassium cyanide reagent combination, (trichloro-silyl cyanide-in situ) is a new, safe and versatile hydrogen cyanide substitute. The reaction of this reagent with saturated aldimines 1a–j and benzophenone oxime 3, in absences of any catalyst, affords the corresponding α-aminonitriles 2a–j and 4, respectively, in excellent yield. Under the same condition the bis-imine
The application of chiral phosphine-Schiff base type ligands in silver(I)-catalyzed asymmetric vinylogous Mannich reaction of aldimines with trimethylsiloxyfuran
作者:Zhi-Liang Yuan、Jia-Jun Jiang、Min Shi
DOI:10.1016/j.tet.2009.05.080
日期:2009.8
Catalytic asymmetric vinylogous Mannich (AVM) reactions of readily available aldimines with trimethylsiloxyfuran in the presence of catalytic amount of AgOAc and chiralphosphine-Schiffbasetypeligands are described, affording the corresponding products in up to 91% yield, anti/syn >99:1 and 81% ee.
描述了在催化量的AgOAc和手性膦-席夫碱型配体存在下,易于获得的醛亚胺与三甲基甲硅烷氧基呋喃的催化不对称乙烯基乙烯基曼尼希(AVM)反应,可提供高达91%的收率的相应产品,抗/ syn > 99: 1和81%ee。