Topic
Hydrazone
About: Hydrazone is a research topic. Over the lifetime, 4853 publications have been published within this topic receiving 65160 citations. The topic is also known as: hydrazone.
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TL;DR: In this paper, an asymmetric Mannich-type reaction of hydrazone 1a with difluoroenoxysilane 2 using chiral phosphine-oxazoline ligand has been reported, giving the adduct 3a in good yields and moderate enantioselectivities under mild conditions.
Abstract: With the catalysis of Zn(OTf)2, Mannich-type reactions of various aromatic hydrazones 1 with difluoroenoxysilane 2 proceeded smoothly to produce 2,2-difluoro-3-oxo-benzohydrazides in 27% –78% yields in THF or DCM under mild conditions. An unexpected monofluorination of hydrazone 1m with difluoroenoxysilane 2 was also disclosed in this paper. The first example of the asymmetric Mannich-type reaction of hydrazone 1a with difluoroenoxysilane 2 using chiral phosphine-oxazoline ligand has been reported, giving the adduct 3a in good yields and moderate enantioselectivities under mild conditions.
35 citations
TL;DR: In this article, azo dyes were synthesized by diazotization of aromatic amines followed by coupling with 2-morpholin-4-yl-1,3-thiazol-4(5 H )-one and fully characterized.
35 citations
TL;DR: Bisantrene, a simple anthracene derivative carrying two imidazolium hydrazone moieties, has been used as a highly selective sensor of ATP in water and displays a bright green fluorescence in the presence of ATP and to a lesser extent also ADP but not with other anions.
35 citations
TL;DR: A chiral hydrazone, (E)-(S)-N'-benzylidene-N, 3-dimethyl-2-hydrazinobutanol (6), was synthesized from (S)-valinol as mentioned in this paper.
Abstract: A chiral hydrazone, (E)-(S)-N'-benzylidene-N, 3-dimethyl-2-hydrazinobutanol (6), was synthesized from (S)-valinol. Compound 6 was reacted with Grignard reagents to give optically pure (2S, 1'S)-N, 3-dimethyl-N'-1'-phenylalkyl-2-hydrazinobutanols (7a and 7b). However, N'-2'-aryl-1'-phenylethyl-N, 3-dimethyl-2-hydrazinobutanols (7c and 7d) were each obtained as a mixture of two diastereomers. Nitrogen-nitrogen bonds of 7a and 7b were cleaved by hydrogenolysis to give (S)-1-phenylalkylamines (8a and 8b), and their absolute configurations and optical purities were confirmed. These reactions were assumed to proceed via the chelated sixmembered ring intermediates.
35 citations
TL;DR: In this article, the key step in the reaction cascade is the cleavage of the N-N bond of the hydrazone fragment of a protonated N-(indolin-1-yl)-1-aza-1,4-dien-3-one intermediate such as 10.
35 citations