申请人:Mansfield Dales Robert John
公开号:US20050101570A1
公开(公告)日:2005-05-12
A process for the preparation of a compound of formula (A) wherein: X is hydrogen or hydroxy, chloro, C
1-6
alkoxy or pheny C
1-6
alkoxy; and R
a
and R
b
are hydrogen, or acyl or phosphate derivatives thereof, which process comprises: (i) the preparation of a compound of formula (I) wherein R
1
is C
1-6
alkyl, or phenyl C
1-6
alkyl in which the phenyl group is optionally substituted; R
2
is hydrogen, hydroxy, chlorine, C
1-6
alkoxy, phenyl C
1-6
alkoxy or amino; and R
3
is halogen, C
1-6
alkylthio, C
1-6
alkylsulphonyl, azido, an amino group or a protected amino group, which preparation comprises the reaction of a compound of formula (II) wherein R
2
and R
3
are as defined for formula (I) with a compound of formula (V) wherein L is a leaving group and R
1
is as defined for formula (I), to give a compound of formula (VI), and thereafter converting the intermediate compound of formula (VI) to a compound of formula (I) via decarboxylation, and as necessary or desired, interconverting variables R
1
, R
2
and R
3
to further values of R
1
, R
2
and R
3
; (ii) the conversion of the resulting compound of formula (I) to a compound of formula (A) by converting variable R
3
, when other than amino, to amino, reducing the ester groups CO
2
R
1
to CH
2
OH and optionally forming acyl or phosphate derivates thereof, and as necessary or desired converting variable R
2
in the compound of formula (I) to variable X in the compound of formula (A); characterized in that R
2
is chloro in formula (I).
一种制备化合物(A)的方法,其中:X为氢或羟基,氯代基,C1-6烷氧基或苯基C1-6烷氧基; Ra和Rb为氢,或酰基或磷酸酯衍生物,所述方法包括:(i)制备化合物(I),其中R1为C1-6烷基,或苯基C1-6烷基,其中苯基可以被取代; R2为氢,羟基,氯代基,C1-6烷氧基,苯基C1-6烷氧基或氨基; R3为卤素,C1-6烷基硫醇基,C1-6烷基磺酰基,叠氮基,氨基或保护氨基,该制备包括将式(II)化合物与式(V)化合物反应,其中R2和R3如式(I)所定义,以得到化合物(VI),然后通过脱羧将中间化合物(VI)转化为化合物(I),并根据需要或希望,将变量R1,R2和R3相互转换为进一步的R1,R2和R3的值; (ii)将所得到的化合物(I)转化为化合物(A),通过将变量R3(当不为氨基时)转化为氨基,还原酯基CO2R1为CH2OH,并可选地形成酰基或磷酸酯衍生物,如有需要或希望,将化合物(I)中的变量R2转化为化合物(A)中的变量X; 其中式(I)中的R2为氯代基。