作者:Surendra Kumar Nayak、Vikramdeep Monga、Navneet Kaur、Rahul Jain
DOI:10.1002/jhet.5570440607
日期:2007.11
protected N-α,N-1(τ)-dialkyl-Lhistidine derivatives. Synthesis of suitably protected N-α,N-1(τ)-dialkyl-L-histidines 7-9 containing different alkyl groups at the N-α and N-1(τ) positions was achieved in four steps starting from L-histidine methyl ester. Whereas, in the one-step alternate route N-α-Boc-L-histidine methyl ester upon direct and simultaneous N-α and N-1(τ) alkylation with various alkyl
两种不同的方法学描述了首先合成适当保护的N- α,N -1(τ)-二烷基-组氨酸衍生物的方法。从L-组氨酸开始的四个步骤中,合成了适当保护的N- α,N -1(τ)-二烷基-L-组氨酸7-9,在N- α和N -1(τ)位置含有不同的烷基甲酯。与此相反,在DMF中,在氢化钠存在下,N -α-Boc-L-组氨酸甲酯通过各种烷基卤直接和同时进行N- α和N -1(τ)烷基化反应,在一步一步的替代路线中,N容易得到N -α,N-1(τ) -二烷基-L-使用组氨酸14包含相同的烷基在Ñ -α和Ñ -1(τ)的位置以高收率。两种方法均允许在组氨酸环的N -α位置容易地进入甲基和其他高级烷基