Steric effects in synthesis—steric limits to the alkylation of nitriles and carboxylic acids
作者:John-Anthony MacPhee、Jacques-Emile Dubois
DOI:10.1016/s0040-4020(01)93693-2
日期:1980.1
The steric limits to the alkylation of aliphatic nitriles and carboxylic acids have been investigated in some detail. For the experimental conditions considered (ionization by i-Pr2NLi in THF followed by alkylation with RI/THF/HMPA) the most hindered nitriles R-CN and carboxylic acids R-CO2H have the same secondary alkyi group RtBuPiCH-, but different tertiary. i.e. Rt-BuPriEtC- or i-Pr3C- for RCN
已经详细研究了脂肪族腈和羧酸烷基化的空间极限。对于所考虑的实验条件(离子化用i-PR 2 NLi等在THF中,随后用RI / THF / HMPA烷基化)的最受阻腈R-CN和羧酸R-CO 2 H与相同二次烷基基团RtBuP我CH-,但不同。即Rt-BuPr我EtC-或I-PR 3 C-为RCN和REt 2的MeC为RCO 2酯,羧酸的烷基化的相对优点的H.比较,和腈被考虑。