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This process increases the amount of RNA present in the cell and their respective encoded proteins. Synthesis of Trichostatin A Trichostatin A was the first naturally occurring HDI to be discovered. It causes an increase in acetylated histones in a variety of mammalian tumor cell line. 45 Trichostatin A was shown to be a selective histone deacetylase inhibitor, reversibly inhibiting classes I, II and IV types of HDAC while not affecting class III. 46 The first portion of the synthesis is shown in scheme 9. The C-N C N-C core of carbodiimides N C N is linear, being related to the negatively charged oxygen must first be activated into a better leaving group. Cipemastat, marimastat, periostat, ilomastat and batimastat are all hydroxamate-based inhibitors of matrix metalloproteinase and are by so used in management of cardiovascular diseases. Hydroxamic acids have been the source of much biochemical interest in recent years reflecting the fact that they demonstrate a wide variety of biological activities.

Following an optimization studies, they found that at 70 and 30 min, highest yield of the hydroxamate was obtained with high purity. Microware Activated Hydroxamic Acid Synthesis Massaro et al 33 has shown that the reaction of esters with hydroxylamine in the presence of a base under microwave activation provides hydroxamic acids in good yield and high purity.

HDAC performs the reverse process of histone acetyl co A to the lysines on the histone, inducing a state known as hyper acetylation.

Hyper acetylation causes a decreased binding of the histones to DNA and leads to chromatin expansion, allowing transcription to take place.

Synthesis of Benzohydroxamic Acid 3 The synthesis of compound 3 was achieved by reacting methyl benzoate 1 and hydroxylamine 2. Synthesis of Hydroxamates Using N, N1, NII–trimethoxy-N, NI, NII-trimethyl Phosphorus Triamides 5 Nui et al 31 reported the conversion of aromatic and aliphatic carboxylic acids, including sterically hindered substrates directly to hydroxamates using N, NI, NII-trimethoxy-N, NI, NII–trimethyl phosphorus triamide 5.

On condensation of aromatic or aliphatic carboxylic acid 4 0.01M and compound 5 0.005M in toluene at 60 for 0.5 to 1 h, the hydroxamate 6 was obtained in excellent yield. Ester Synthesis of Hydroxamate Riva et al 32 reported the transformation of methyl or ethyl carboxylic esters into the corresponding hydroxamic acid.

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