Intermediates for the synthesis of camptothecin of the formula II
wherein:
R1 is —(CH2)2NR1R2, where R1 is an amino protecting group and R2 is C2-C5 alkyl, hydroxyethyl or acetoxyethyl group, and of the formula III
wherein:
n is 1 or 2;
R3 is hydrogen or —OR4, where R4 is hydrogen, —COR5, —CONHR6 or CH2OR7, where R5 is methyl or —CH2OCH3, R6 is isopropyl, phenyl or —CH2CH2Cl, and R7 is methyl, ethyl or —CH2CH2OCH3; with the proviso that when n is 2, R3 is not hydrogen.
合成
紫杉醇的中间体,其
化学式为II,其中:R1为—(
CH2)2NR1R2,其中R1为
氨基保护基团,R2为C2-C5烷基、羟乙基或乙酰氧乙基基团,以及
化学式III,其中:n为1或2;R3为氢或—OR4,其中R4为氢,—COR5,—CONHR6或 OR7,其中R5为甲基或— OCH3,R6为异丙基,苯基或— Cl,R7为甲基,乙基或— OCH3;但当n为2时,R3不为氢。