Enantioselective Protonation of Radical Anion Intermediates in Photoallylation and Photoreduction Reactions of 3,3-Diaryl-1,1-dicyano-2-methylprop-1-ene with Allyltrimethylsilane
作者:Hajime Maeda、Masayuki Iida、Daisuke Ogawa、Kazuhiko Mizuno
DOI:10.3390/molecules24142677
日期:——
transfer pathways. When (S)-mandelic acid was used as the proton source, the reactions proceeded with 3.4 and 4.8 %ee for formation of 3 and 4, respectively. The results of studies of the effect of aryl ring substituents and several chiral carboxylic acids suggested that the enantioselectivities of the reactions are governed by steric controlled proton transfer in intermediate complexes formed by π-π and
在菲作为光氧化还原催化剂和乙酸作为质子源存在下,3,3-二芳基-1,1-二氰基-2-甲基丙-1-烯(1a-c)与烯丙基三甲基硅烷(2)的乙腈溶液的光反应通过光诱导电子转移途径形成光烯丙基化 (3) 和光还原 (4) 产物。当(S)-扁桃酸用作质子源时,反应分别以3.4%和4.8%ee进行以形成3和4。芳环取代基和几种手性羧酸影响的研究结果表明,反应的对映选择性受空间控制的质子转移控制,中间复合物中由 1a– 衍生的阴离子自由基的 π-π 和 OH-π 相互作用形成。 c和手性羧酸。