Insights into the Molecular Recognition Process in Organocatalytic Chemoselective Monoacylation of 1,5-Pentanediol
作者:Ayumi Imayoshi、Masahiro Yamanaka、Makoto Sato、Keisuke Yoshida、Takumi Furuta、Yoshihiro Ueda、Takeo Kawabata
DOI:10.1002/adsc.201600010
日期:2016.4.14
suggested to play the key role in selective monoacylation. On the other hand, the indolyl NH group in the amide side chain of the catalysts was found to be critically important for further increasing the chemoselectivity of monoacylation only when the catalyst has a C2‐symmetrical structure. The effects of the catalyst structure on the chemoselective monoacylation were elucidated by DFT calculations, and
长链直链二醇的单酰化常常遇到与不可避免的提供二酰化物的过度酰化相关的困难。然而,发现几种C 1和C 2对称的吡咯烷吡啶(PPY)催化剂可有效地促进1,5-戊二醇的化学选择性单酰化。研究了催化剂结构对单酰化性能的影响。C 1-和C 2均在吡咯烷环中的酰胺羰基有人建议对称对称催化剂在选择性单酰化中起关键作用。另一方面,发现仅在催化剂具有C 2对称结构时,催化剂酰胺侧链中的吲哚基NH基对于进一步提高单酰化的化学选择性至关重要。通过DFT计算阐明了催化剂结构对化学选择性单酰化的影响,并揭示了催化剂对1,5-戊二醇的精确分子识别的起源以及这些官能团对过渡态(TS)稳定作用的影响。