CN1349998A - 半乳糖3,6位支化寡糖的简易合成 - Google Patents

半乳糖3,6位支化寡糖的简易合成 Download PDF

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CN1349998A
CN1349998A CN 01135005 CN01135005A CN1349998A CN 1349998 A CN1349998 A CN 1349998A CN 01135005 CN01135005 CN 01135005 CN 01135005 A CN01135005 A CN 01135005A CN 1349998 A CN1349998 A CN 1349998A
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lactosi
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branching
glucose
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宁君
王海荣
孔繁祚
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Research Center for Eco Environmental Sciences of CAS
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Abstract

本发明涉及以1,2,5,6-二-O-异丙叉基-α-D-半乳呋喃糖为起始原料制备具有重要生物学功能的半乳糖3,6位支化的寡糖的一种简便、高效的化学合成方法。

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半乳糖3,6位支化寡糖的简易合成
本发明属于有生物活性的寡糖的制备领域,特别是涉及能用于药物筛选的寡糖的合成方法。
在许多细菌、真菌及原生动物中都含有半乳糖3和6位支化的寡糖,并且发现这些寡糖与肠道疾病,胸膜肺炎,肺结核以及艾滋病等有密切关系。因此合成半乳糖3,6位支化的寡糖具有重要意义。
本发明目的在于提供一种半乳糖3和6位支化的寡糖的简便而高效的合成方法。
本发明的合成方法在于:
以1,2:5,6-二-O-异丙叉基-α-D-半乳呋喃糖为受体,以单糖(包括所有单糖如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)为供体(如Schmidt试剂等),以路易斯酸如TMSOTf为催化剂的简便、高效的合成半乳糖3,6位支化的寡糖的方法。
在干燥的二氯甲烷溶剂体系中,以1,2:5,6-二-O-异丙叉基-α-D-半乳呋喃糖1和任何一种单糖(如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)供体2(以葡萄糖Schmidt试剂为例)为起始原料,以路易斯酸(以TMSOTf为例)为催化剂,分子筛干燥的条件下,高效、简便的合成半乳糖3位支化的二糖。
Figure A0113500500041
Bz=Benzoyl
将二糖3以醋酸水溶液(V/V),在水浴中处理,可脱除5,6异丙叉基,得到5,6位为游离羟基的二糖4。
Figure A0113500500051
在干燥的二氯甲烷溶剂体系中,以TMSOTF为催化剂,分子筛干燥的条件下,使4与任何一种单糖(如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)供体1(以葡萄糖Schmidt试剂为例)反应,得到半乳糖3,6位支化的寡糖5,5也可作为受体三糖在5位连接其它糖得到更大的寡糖。
Figure A0113500500052
将5在醋酸水溶液(V/V)中回流5-6小时,可脱除1,2位异丙叉基,得到1,2位为游离羟基的3,6支化的半乳吡喃糖寡糖6。
Figure A0113500500053
将6用常规方法乙酰化可得1,2,5位乙酰化的三糖7。
Figure A0113500500054
将7用常规方法脱除1位乙酰基得三糖8。
Figure A0113500500061
将8在干燥的二氯甲烷体系中用K2CO3催化,加入三氯乙氰可得到能继续在1位进行偶连反应的三糖供体Schmidt试剂9。
Figure A0113500500062
下面结合实施例对本发明进行详细的说明(1)二糖3的合成:
向1.1当量的苯甲酰化的葡萄糖Schmidt 1和1,2;5,6-二-氧-异丙叉基-半乳呋喃糖受体2(1g,3.846mmol)中加入干燥过的二氯甲烷25ml,并加入2g分子筛,密封,室温搅拌20min,然后加入50μl催化剂TMSOTf,继续搅拌20min,TLC分析生成单一产物3(2.578g,80%,以受体2计)。(2):二糖4的合成:
Figure A0113500500071
向二糖3(1g,1.193mmol)中加入90%的醋酸水溶液(V/V)50ml,在35℃水裕中反应15h,浓缩后柱色谱分离得5,6开叉的二糖4(0.8094g,85%)。(3):三糖5的合成:
向1.1当量的苯甲酰化的葡萄糖Schmidt 1和二糖4(1g,1.193mmol)中加入干燥过的二氯甲烷20ml,并加入2g分子筛,密封,室温搅拌20min,然后加入30μl催化剂TMSOTTf,继续搅拌20min,TLC分析得单一得产物5(1.395g,85%,以受体计)。(4):三糖6的合成:
取5(1g,0.726mmol)在80%的醋酸水溶液(V/V)中回流5-6h,浓缩后柱色谱分离得产物6(0.825g,85%)。(5):三糖7的合成:
向6(1g,0.748mmol)中加入20ml乙酐,16ml吡啶,室温放置24h,即反应生成7(1.040g,95%)。(6):三糖8的合成:
向7(1g,0.684mmol)中加入DMF40ml,加入7g(NH4)2CO3,40℃下,机械搅拌15h,即生成8(0.777g,80%)。(7):三糖9的合成:
Figure A0113500500082
向8(1g,0.704mmol)中加入20ml干燥过得二氯甲烷,0.5ml三氯乙氰,并加入2g碳酸钾,电磁搅拌7h,即生成9(0.88g,80%)。

Claims (1)

1.一种以1,2:5,6-二-O-异丙叉基-α-D-半乳呋喃糖为受体,以单糖(包括所有单糖如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)为供体(如Schmidt试剂等),以路易斯酸如TMSOTf为催化剂合成半乳糖3,6位支化寡糖的简便、高效方法。其特征在于:
(1)在干燥的二氯甲烷溶剂体系中,以1,2:5,6-二-O-异丙叉基-α-D-半乳呋喃糖1和任何一种单糖(如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)供体2(以葡萄糖Schmidt试剂为例)为起始原料,以路易斯酸(以TMSOTf为例)为催化剂,分子筛干燥的条件下,高效、简便的合成半乳糖3位支化的二糖。
Bz=Benzoyl(2)将连接的二糖3以醋酸水溶液(V/V),在水浴中处理,可脱除5,6异丙叉基,得到5,6位为游离羟基的单一产物4。
Figure A0113500500022
(3)在干燥的二氯甲烷溶剂体系中,以TMSOTF为催化剂,分子筛干燥的条件下,使4与任何一种单糖(如葡萄糖、阿拉伯糖,半乳糖、甘露糖等)供体1(以葡萄糖Schmidt试剂为例)反应,得到半乳糖3,6位支化的寡糖5。
Figure A0113500500023
(4)将5在醋酸水溶液(V/V)中回流5-6小时,可脱除1,2位异丙叉基,得到1,2位为游离羟基的3,6支化的半乳吡喃糖寡糖6。
Figure A0113500500031
(5)将6用常规方法乙酰化可得1,2,5位乙酰化的三糖7。(6)将7用常规方法脱除1位乙酰基得三糖8。
Figure A0113500500033
(7)将8用常规方法制得能继续在1位反应的三糖供体Schmidt试剂。
Figure A0113500500034
CN 01135005 2001-11-14 2001-11-14 半乳糖3,6位支化寡糖的简易合成 Pending CN1349998A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106317130A (zh) * 2016-08-08 2017-01-11 中国农业大学 表乳糖的批量合成方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106317130A (zh) * 2016-08-08 2017-01-11 中国农业大学 表乳糖的批量合成方法
CN106317130B (zh) * 2016-08-08 2019-02-05 中国农业大学 表乳糖的批量合成方法

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