Novel C6-substituted furanoid sugar amino acids and improved process for preparing the same
申请人:Chakraborty Kanti Tushar
公开号:US20060014939A1
公开(公告)日:2006-01-19
The present invention relates to furanoid sugar amino acids and their salts which carrying an additional chiral center at C6-position with substituents and resembling the side-chains of natural amino acids. More particularly, 6-substituted-6-deoxy-6-amino-2,5-anhydroaldonic acids and their 3,4-dideoxy congeners, in enantiomerically pure forms, which constitute an important class of conformationally constrained peptide building blocks that can be used as dipeptide isosteres in peptidomimetic studies.
R
1
=H, Boc, Cbz, Fmoc, acetyl or salts such as HCl, TFA
R
2
=CH
3
—, (CH
3
)
2
CH—, (CH
3
)
2
CHCH
2
—, CH
3
CH
2
CH(CH
3
)—, alkyl groups, OR
3
)CH
2
—, CH
3
(OR
3
)CH—, (R
3
S)CH
2
—, CH
3
SCH
2
CH
2
—, (RHN)CH
2
CH
2
CH
2
CH
2
—, (CONH
2
)CH
2
—, (CONH
2
)CH
2
CH
2
—, (CO
2
R
5
)CH
2
—, (CO
2
R
5
)CH
2
CH
2
—, Ph-, Ar-, PhCH
2
—, ArCH
2
—, Phenylalkyl-, arylalkyl-, (indolyl)CH
2
—, (imidazolyl)CH
2
—, and all other amino acid side-chains
R
3
=H, tert-butyl, alkyl, benzyl, arylCH
2
, CO(alkyl), CO(arylalkyl), SO
3
H, PO
3
H
2
, silyl,
R
4
=—O-alkyl, —O-arylalkyl, -amine, -alkylamine, -arylalkylamine, and others
R
5
=H, tert-butyl, alkyl, benzyl, arylCH
2
,
R
1
-R
2
=—(CH
2
)
n
— (n=2,3,4)
该发明涉及呋喃糖氨基酸及其盐,其在C6位置携带具有取代基的额外手性中心,并类似于天然氨基酸的侧链。更具体地说,6-取代-6-去氧-6-氨基-2,5-缩水醛酸及其3,4-二去氧同分异构体,以对映异构纯形式存在,构成一类重要的构象受限的肽段构建块,可用作肽类模拟研究中的二肽同分异构体。R1=H,Boc,Cbz,Fmoc,乙酰基或盐,如HCl,TFA;R2=CH3—,(CH3)2CH—,(CH3)2CHCH2—,CH3CH2CH(CH3)—,烷基,OR3)CH2—,CH3(OR3)CH—,(R3S)CH2—,CH3SCH2CH2—,(RHN)CH2CH2CH2CH2—,(CONH2)CH2—,(CONH2)CH2CH2—,(CO2R5)CH2—,(CO2R5)CH2CH2—,Ph-,Ar-,PhCH2—,ArCH2—,苯基烷基-,芳基烷基-,(吲哚基)CH2—,(咪唑基)CH2—,以及所有其他氨基酸侧链;R3=H,叔丁基,烷基,苄基,芳基CH2,CO(烷基),CO(芳基烷基),SO3H,PO3H2,硅基;R4=—O-烷基,—O-芳基烷基,-胺,-烷基胺,-芳基烷基胺,等;R5=H,叔丁基,烷基,苄基,芳基CH2;R1-R2=—(CH2)n—(n=2,3,4)。