The invention relates to carbonates of formula: ##STR1## in which X is a fluorine, chlorine or bromine atom and R.sup.1 is different from the ##STR2## group and represents: a substituted or non-substituted, saturated or unsaturated, aliphatic, araliphatic, primary, secondary, tertiary or cycloaliphatic radical. These .alpha.-chlorinated carbonates are prepared by the action of a compound of formula R.sup.1 OH on a chloroformate of formula: ##STR3## in a solvent medium in the presence of an acid scavenger which is added after the two preceding compounds. They are used to block the amine function of amino acids. The .alpha.-chlorinated carbonate and amino acid are reacted in a solvent medium at a temperature of -5.degree. to 100.degree. C. in the presence of an acid scavenger. Blocked amines are very useful in peptide synthesis.
该发明涉及以下式的
碳酸盐:##STR1##其中X是
氟、
氯或
溴原子,R.sup.1不同于##STR2##组,并表示:取代或未取代的饱和或不饱和的脂肪族、芳基脂肪族、一次、二次、三次或环脂肪基。这些α-
氯化
碳酸盐是通过化合物R.sup.1 OH对以下式的
氯甲酸酯的作用在溶剂介质中在两个前述化合物之后添加的酸清除剂的存在下制备的。它们用于阻断
氨基酸的胺基。在溶剂介质中,α-
氯化
碳酸酯和
氨基酸在-5℃至100℃的温度下在酸清除剂的存在下反应。阻断的胺基在肽合成中非常有用。