a-Amino Acids, compositions and process for preparing said compounds a-ethynyl- and - a-vinyl- 3,4- disubstituted pheynylalanines and esters thereof, have been prepared by reaction of methyl 3,4-dihydroxybenzoate with diphenyldichloromethane, reduction of the so obtained methyl 3,4-diphenylmethylene- dioxy- benzoate to 3,4-diphenylmethylenedioxybenzyl- alcohol, and transforming this to the benzylchloride. This 3,4-diphenylmethylenedioxybenzylchloride reacts with 1-trimethyl- silyl-N- benzylidene-3-aminoprop-1-yneto form 3-(3,4- diphenylmethylenedioxybenzyl) -1-trimethysilyl N-benzylidene-3- aminoprop-1-yne.
With methyl chloroformate this compound gives 3-carbomethoxy-3- (3,4- diphenylmethylenedioxybenzyl-1-trimethylsilyl -N-benzylidene -3-aminoprop-1-yne.
The benzylidene-group, the trimethylsilyl-group and the diphenyl-methylene- group are removed, which results in the formation of a-ethynyl- 3,4-dihydroxy- phenylalanine.
The a-vinyl- analog is obtained by hydrogenation of an intermediate. The compounds have a pharmaceutical activity.
a-
氨基酸、制备所述化合物的组合物和工艺 a-
乙炔基和-a-
乙烯基-3,4-二取代的苯丙
氨酸及其
酯类,是由 3、4-二羟基
苯甲酸甲酯与二苯基
二氯甲烷反应,将得到的 3,4-二苯基亚甲基二氧基
苯甲酸甲酯还原成 3,4-二苯基亚甲基二氧基
苄醇,并将其转化为苄基
氯。这种 3,4-二苯基亚甲基二氧苄基盐酸盐与 1-三甲基
硅基-N-亚苄基-3-
氨基丙-1-炔反应生成 3-(3,4-二苯基亚甲基二氧苄基)-1-三甲基
硅基 N-亚苄基-3-
氨基丙-1-炔。
该化合物与
氯甲酸甲酯反应生成 3-甲氧羰基-3-(3,4-二苯基亚甲基二氧苄基)-1-三甲基
硅基 N-亚苄基-3-
氨基丙-1-炔。
去掉亚苄基、三甲基
硅基和二苯基亚甲基后,形成 a-
乙炔基-3,4-二羟基-苯丙
氨酸。
a-
乙烯基类似物是通过中间体氢化得到的。这些化合物具有药物活性。