preparation of 2′,3′-cyclic Coenzyme A (5). It was readily prepared in a good yield from the reaction of adenosine-5′ 2-dimethylamino-4-nitrophenyl phosphate (3) with D-pantethine-4′,4″-diphosphate (4) in the presence of acetic acid in pyridine. Compound 3 and the diphosphate 4 were prepared in a good yield from the condensation of adenosine (1) with 2-dimethylamino-4-nitrophenyl phosphate (2) in the presence
Chemical synthesis of coenzyme A analogs of a modified cysteamine moiety
作者:M. Shimizu、O. Nagase、Y. Hosokawa、H. Tagawa
DOI:10.1016/s0040-4020(01)88434-9
日期:1968.1
Some coenzyme A analogs, such as α-methyl-(IVc), β-methyl-(IVd), and α-carboxy-coenzyme A (IVe), have been synthesized from the nitrile compound (Ib) and cysteamine derivatives (IIc–e) via the respective thiazoline intermediates (IIIc–e). Homo-coenzyme A (XII) has been synthesized by a combination of the methods of Moffatt and Khorana, for the formation of pyrophosphate, and Michelson, for 2′, 3′-cyclic
Investigations on Pantothenic Acid and Its Related Compounds. IV. Chemical Studies. (3). Syntheses of D-Pantetheine 4'-Phosphate and N-D-Pantothenoyl-L-cysteine 4'-Phosphate
作者:Osamu Nagase
DOI:10.1248/cpb.15.648
日期:——
D-Pantetheine 4'-phosphate (VIa) and D-pantothenoyl-L-cysteine 4'-phosphate (VIb) was prepared by two different routes. The first involved reaction of D-pantothenonitrile 4'-dibenzyl phosphate (II) with cysteamine or L-cysteine followed by acid hydrolysis and then reduction with sodium in liquid ammonia. In the second route, D-pantothenonitrile 4'-phosphate (VII) was treated with cysteamine or L-cysteine to form thiazoline (VIII), which was then hydrolyzed.
A pantethine phosphate ester represented by the following formula (1) or formula (2) exhibits superior tyrosinase inhibitory effect and melanin production inhibitory effect.