Photodecarboxylative additions of N-protected α-amino acids to N-methylphthalimide
作者:Sonia Gallagher、Fadi Hatoum、Nicolai Zientek、Michael Oelgemöller
DOI:10.1016/j.tetlet.2010.05.020
日期:2010.7
Photoreactions involving N,N-dimethylated α-amino acid salts and N-methylphthalimide are dominated by photoreduction and acetone trapping. Only, N-phenyl glycinate underwent photodecarboxylative addition in a moderate yield of 30%. In contrast, N-acylated α-amino acid salts readily gave addition products in fair to high yields of 20–95%. Comparison experiments with N,N-dimethylacetamide and amino-/amido-containing
涉及N,N-二甲基化α-氨基酸盐和N-甲基邻苯二甲酰亚胺的光反应以光还原和丙酮捕获为主导。仅甘氨酸N-苯基酯以30%的中等收率进行光脱羧。相反,N-酰化的α-氨基酸盐可以很容易地以20-95%的高至中等收率获得加成产物。与N,N-二甲基乙酰胺和含氨基/氨基的邻苯二甲酰亚胺的对比实验揭示了关键的电子转移步骤的起源和反应顺序NR 3 » RCO2个-- ⩾RCONR 2成立。