3685-20-9Relevant articles and documents
Selective inhibition of bovine plasma amine oxidase by homopropargylamine, a new inactivator motif
Qiao, Chunhua,Jeon, Heung-Bae,Sayre, Lawrence M.
, p. 8038 - 8045 (2007/10/03)
Propargylic and activated allylic amines are known to inactivate the quinone-dependent plasma amine oxidases, possibly through active-site modification by the α,β-unsaturated aldehyde turnover products. Although homopropargylamine (1-amino-3-butyne, 1) is a nonobvious candidate as a mechanism-based inhibitor, 1 was found to be an unusually potent time- and concentration-dependent irreversible inactivator of bovine plasma amine oxidase (BPAO), exhibiting a 30 min IC50 of 2.9 μM at 30 °C ([BPAO] = 1.2 μM). Preserved cofactor redox activity of the denatured inactivated enzyme indicates that inactivation by 1 involves either a cofactor modification that reverses upon enzyme denaturation or a modification of an active-site residue. Because inactivation by 1 may involve enzyme alkylation by the reactive 2,3-butadienal (3) tautomer of the 3-butynal turnover product of 1, aldehyde 3 was prepared and was found to inactivate BPAO, but only at high concentration. In addition, whereas inhibition by 3 was blunted by the presence of mercaptoethanol, no such protection was observed against 1. The amine whose turnover should lead directly to 3 was prepared (1-amino-2,3-butadiene, 4) and was found to be an even more potent inactivator of BPAO than 1, exhibiting a 5 min IC50 of 1.25 μM. Rat liver mitochondrial monoamine oxidase was also inactivated by 4, as expected, but only very weakly by 1. Potential mechanisms explaining the selective inhibition of BPAO by 1 are discussed.
Reactions of Unsaturated Azides, 8. - Azidobutatriene and Azidobutenynes
Banert, Klaus
, p. 1175 - 1178 (2007/10/02)
When 1-azido-4-chloro-2-butyne (11), obtained from 1,4-dichloro-2-butyne (10), is treated with sodium hydroxide in methanol, 4-ethynyl-1H-1,2,3-triazole (19) is the main product besides the two triazoles 9 and 21.On the way from 11 to 19 and 21 azidobutatriene (14) most probably acts as a short-lived intermediate leading to five-membered heterocyclic compounds as azidoallenes do.In contrast to 14, the azidobutenynes 23 and 27 are relatively stable.They mainly give 2H-azirines (24, 28) on thermolysis and photolysis. - Keywords: Azidobutatriene, ring closure of; Triazole, preparation via azidobutatriene; Azirines
METHANOLYSIS OF VICINALLY SUBSTITUTED TETRAHALOGENOBUTENES
Mavrov, M. V.
, p. 626 - 632 (2007/10/02)
The methanolysis of Z,E-1,2,3,4-tetrabromo-1-butene in the presence of strong bases leads predominantly to the formation of the ortho ester 1,1,1-trimethoxy-2,3-butadiene and the ether-acetal 1,1,4-trimethoxy-2-butyne.In the case of E-2,3-dibromo-1,4-dichloro-2-butene it leads predominantly to the ortho ester.During the reaction 10-12 linear unsaturated products containing 1-3 methoxyl groups are formed as side products.
