[EN] METATHESIS REACTION INVOLVING THE UNSATURATED SIDE CHAIN OF AN ALPHA, ALPHA-DISUBSTITUTED AMINO ACID<br/>[FR] REACTION DE METATHESE FAISANT APPEL A LA CHAINE LATERALE INSATUREE D'UN ACIDE AMINE ALPHA, ALPHA-DISUBSTITUE
申请人:DSM IP ASSETS BV
公开号:WO2004101476A1
公开(公告)日:2004-11-25
The invention relates to a process for amino acid synthesis, i.e., the preparation of side chain unsaturated α,α-disubstituted-α-amino acid derivatives with formula (1) wherein: * denotes a stereogenic C-atom PG represents an N-protecting group or the C-terminal part of an optionally protected amino acid or peptide chain; X represents an optionally substituted amine group or an alkoxy group; R1 represents an optionally substituted alkyl group; Ri represents R2 or R3; if Ri = R2 then Rii = R5 and if Ri = R3 then Rii = H; R2, R3 and R5 each independently represent H, an optionally substituted (cyclo)alkyl, (hetero)aryl, acyl, alkoxycarbonyl, cyano, di-alkylphosphonyl, oxiranyl group, a CHO group optionally protected as its acetal, or a group derived from an O-protected carbohydrate, or R2 and R5 may form together with the C-atorn to which they are attached an optionally substituted hydrocarbon ring, with the proviso that R2 , R3 and R5 do not all represent H at the same time. R4 represents H, an alkyl group or an aryl group; n represents an integer larger than or equal to 0, via a cross metathesis reaction between the corresponding amino acid derivative precursor and an (eventually substituted) alkene.
该发明涉及一种氨基酸合成方法,即制备具有式(1)的侧链不饱和α,α-二取代-α-氨基酸衍生物的过程,其中:*表示一个立体异构的C原子,PG代表一个N保护基团或者一个可选择保护的氨基酸或肽链的C末端部分;X代表一个可选择取代的胺基团或者一个烷氧基团;R1代表一个可选择取代的烷基团;Ri代表R2或R3;如果Ri = R2,则Rii = R5,如果Ri = R3,则Rii = H;R2、R3和R5分别独立地代表H,一个可选择取代的(环)烷基,(杂环)芳基,酰基,烷氧羰基,氰基,二烷基膦基,环氧丙基基团,一个CHO基团,可选择保护为其缩醛基团,或者源自一个O保护的碳水化合物的基团,或者R2和R5可以与它们附着的C原子一起形成一个可选择取代的碳氢环,条件是R2、R3和R5不能同时代表H。R4代表H,一个烷基团或者一个芳基;n代表大于或等于0的整数,通过相应氨基酸衍生物前体与(可能取代的)烯烃之间的交叉甲醇反应。