between a vitaminB12 derivative containing a peripheral C18 alkyl chain (see 1a) and a (methyl)thiomalonate substrate bearing alkyl chains of various length at the thioester group (see 5) was investigated. A catalytic cycle was established for the methylmalonylsuccinyl rearrangement by using electrochemistry and photolysis (see Scheme 3). Increased yields of the succinate relative to the reduction product
研究了包含外围C 18烷基链的维生素B 12衍生物(参见1a)与在硫酯基团上带有不同长度烷基链的(甲基)硫代丙二酸酯底物之间的相互作用(参见5)。通过使用电化学和光解作用建立了用于甲基丙二酰基琥珀酰基重排的催化循环(参见方案3)。当反应在MeOH / H 2 O中进行时,并且当底物和催化剂都具有能够进行疏水相互作用的十八烷基取代基时,相对于还原产物,琥珀酸酯的产率相对于还原产物提高了。
The Co(i) induced methylmalonyl-succinyl rearrangement in a model for the coenzyme B12 dependent methylmalonyl-CoA mutase
作者:Fangping Sun、Tamis Darbre
DOI:10.1039/b305782h
日期:——
The rearrangement of 2-bromomethyl-2-methylmonothiomalonates to succinyl derivatives was found to take place in quantitative yields in the presence of one molar equivalent of Co(I) generated by the reduction of heptamethyl Co(II)yrinate perchlorate with NaBH4 or electrochemically. The chiral thiomalonate gave racemic succinate.
The rearrangement of methylmalonyl to succinyl radicals becomes an efficient process, when the reaction is performed in a protic solvent with both the vitamin B12-derived catalyst and the substrate carrying a C18 instead of a C2 alkyl chain.