申请人:Kotthaus Martina
公开号:US20070112216A1
公开(公告)日:2007-05-17
The invention relates to a method for producing chiral mercapto amino acids of formula (I) wherein R
1
, R
2
and R
3
can represent hydrogen, C
6
-C
12
aryl, C
1
-C
6
-alkyl-C
6
-C
12
-aryl, C
6
-C
12
-aryl-C
1
-C
6
-alkyl, C
1
-C
18
-alkyl or C
2
-C
18
-alkenyl, R
2
and R
3
forming a saturated or unsaturated ring. According to said method, a) an oxo compound of formula (II), wherein X represents a leaving group, is reacted in the presence of ammonia or ammonium hydroxide and a sulfide, optionally under phase transfer catalysis or addition of a solubiliser, with a ketone or an aldehyde of formula (III) wherein R
4
and R
5
can represent a C
1
-C
12
alkyl radical or a C
6
-C
20
aryl radical or one of the two radicals H, or R
4
and R
5
together form a C
4
-C
7
ring, to form the compound of formula (IV), that b) reacts with HCN to form the corresponding nitrile, whereupon c) the crystallised nitrile is converted, by selective hydrolysis by means of a mineral acid, into the corresponding amide of formula (VI), and d) is then converted into the corresponding chiral amide of formula (VI*) by means of an L amidase or a chiral dissociating acid, whereupon by reaction with an acid, the desired chiral mercapto amino acid of formula (I) is obtained, or e) first the reaction with an acid is carried out, and then the conversion into the chiral mercapto amino acid takes place.
本发明涉及一种制备手性巯基氨基酸的方法,其化学式为(I),其中R1、R2和R3可以代表氢、C6-C12芳基、C1-C6烷基-C6-C12芳基、C6-C12芳基-C1-C6烷基、C1-C18烷基或C2-C18烯基,R2和R3形成饱和或不饱和环。根据该方法,a)在氨或氢氧化铵和硫化物的存在下,通过相转移催化或添加溶解剂,将化学式为(II)的氧化合物与化学式为(III)的酮或醛反应,其中R4和R5可以代表C1-C12烷基基团或C6-C20芳基基团或其中的一个基团H,或R4和R5共同形成C4-C7环,以形成化合物的化学式(IV),然后b)与HCN反应形成相应的腈,然后c)通过矿酸的选择性水解将结晶的腈转化为化学式(VI)的相应酰胺,d)然后通过L酰胺酶或手性解离酸将其转化为化学式(VI*)的相应手性酰胺,然后通过与酸的反应获得所需的手性巯基氨基酸的化学式(I),或e)首先进行与酸的反应,然后进行转化为手性巯基氨基酸。