Facile synthesis of<i>N</i>-α-boc-1,2-dialkyl-l-histidines: Utility in the synthesis of thyrotropin-releasing hormone (trh) analogs and evaluation of the cns activity
作者:Vikramdeep Monga、Chhuttan Lal Meena、Navneet Kaur、Satyendra Kumar、Chandrashekhar Pawar、Shyam Sunder Sharma、Rahul Jain
DOI:10.1002/jhet.5570450608
日期:2008.11
starting from N-α-trifluoroacetyl-L-histidine methyl ester is reported. The key steps involve direct and regiospecific N-1(τ) ring-alkylation of the N-α-trifluoroacetyl-L-histidine-methyl ester by suitable alkyl iodide in the presence of NaH in DMF at −15 °C followed by homolytic free radical C-2 alkylation via a silver catalyzed oxidative decarboxylation of alkylcarboxylic acid in the presence of ammonium
据报道从N -α-三氟乙酰基-L-组氨酸甲酯容易地合成N -α-Boc-1,2-二烷基-L-组氨酸。关键步骤包括在合适的烷基碘存在下,在DH中在-15°C的DMF中,通过合适的烷基碘,对N -α-三氟乙酰基-L-组氨酸-甲酯进行直接和区域特异性的N-1(τ)环烷基化,然后进行均质游离在酸性条件下,在过硫酸铵存在下,通过银催化烷基羧酸的氧化脱羧,实现C-2自由基的烷基化。新合成的生物咪唑在促甲状腺激素释放激素(TRH)中的应用说明了其应用。体内评估了合成的TRH类似物用于止痛药。我们报告发现TRH类似物的发现,发现它可以增强戊巴比妥诱导的体内睡眠。