Synthesis and structural studies of flavin and alloxazine adducts with O-nucleophiles
作者:Petra Ménová、Václav Eigner、Jan Čejka、Hana Dvořáková、Miloslav Šanda、Radek Cibulka
DOI:10.1016/j.molstruc.2011.08.002
日期:2011.10
1a-OH, 1b-OH, and 2a-OMe, the crystal structures were determined by X-ray diffraction. Flavinium and alloxazinium salts are in rapid equilibria with their adducts in water or methanolic solutions without the presence of a base. It was found that the equilibrium constants for flavin adduct formation is higher by six orders of magnitude than those for alloxazine derivatives. The presence of the sp3 hybridized
摘要 五种黄素 (isoalloxazine) 和 alloxazine 与 O-亲核试剂、5-ethyl-4a-hydroxy-3,7,8,10-tetramethyl-4a,5-dihydroisoalloxazine (1a-OH)、5-ethyl-4a-hydroxy-3,7,8,10-dihydroisoalloxazine (1a-OH) 的加合物-3,10-二甲基-4a,5-二氢异咯嗪 (1b-OH), 5-乙基-4a-甲氧基-3,10-二甲基-4a,5-二氢异恶嗪 (1b-OMe), 5-乙基-4a-羟基-1,3-二甲基-4a,5-二氢咯嗪 (2a-OH) 和 5-乙基-4a-甲氧基-1,3-二甲基-4a,5-二氢咯嗪 (2a-OMe) 由相应的盐制备,5 -乙基-3,7,8,10-四甲基异恶嗪鎓 (1a)、5-乙基-3,10-二甲基异恶嗪鎓 (1b) 和 5-乙基-1,3-二甲基异恶嗪鎓