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—,(   )2CH—,(   )2CH   —,      CH(   )—,烷基,OR3)
CH2—,   (OR3)CH—,(R3S)   —,   S      —,(RHN)            —,(CONH2)   —,(CONH2)      —,(CO2R5)   —,(CO2R5)      —,Ph-,Ar-,Ph   —,Ar   —,苯基烷基-,芳基烷基-,(
吲哚基)   —,(
咪唑基)   —,以及所有其他
氨基酸侧链;R3=H,叔丁基,烷基,苄基,芳基   ,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   ;R1-R2=—(   )n—(n=2,3,4)。