CN108929334B - 一种吗啉二酮类天然生物碱及其衍生物的制备方法 - Google Patents
一种吗啉二酮类天然生物碱及其衍生物的制备方法 Download PDFInfo
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- SGTNSNPWRIOYBX-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-5-{[2-(3,4-dimethoxyphenyl)ethyl](methyl)amino}-2-(propan-2-yl)pentanenitrile Chemical compound C1=C(OC)C(OC)=CC=C1CCN(C)CCCC(C#N)(C(C)C)C1=CC=C(OC)C(OC)=C1 SGTNSNPWRIOYBX-UHFFFAOYSA-N 0.000 description 1
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- KLDLRDSRCMJKGM-UHFFFAOYSA-N 3-[chloro-(2-oxo-1,3-oxazolidin-3-yl)phosphoryl]-1,3-oxazolidin-2-one Chemical compound C1COC(=O)N1P(=O)(Cl)N1CCOC1=O KLDLRDSRCMJKGM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D498/12—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains three hetero rings
- C07D498/14—Ortho-condensed systems
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Cosmetics (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
本发明公开了一种吗啉二酮类天然生物碱及其衍生物的制备方法,具体为Javanicunine A,Javanicunine B,9‑Deoxy‑PF1233 A和9‑Deoxy‑PF1233 B及其衍生物的制备方法。本发明提供的制备方法能够大规模制备Javanicunine A,Javanicunine B,9‑Deoxy‑PF1233 A和9‑Deoxy‑PF1233 B及其衍生物,而且操作步骤少,其中,Javanicunine A的总收率能够达到20%以上,Javanicunine B的总收率能够达到10%以上,9‑Deoxy‑PF1233 A的总收率能够达到8%以上,9‑Deoxy‑PF1233 B的总收率能够达到12%以上。
Description
技术领域
本发明涉及化合物制备技术领域,更具体地,涉及一种吗啉二酮类天然生物碱Javanicunine A,Javanicunine B,9-Deoxy-PF1233 A和9-Deoxy-PF1233 B及其衍生物的制备方法。
背景技术
天然产物Javanicunine A,Javanicunine B,9-Deoxy-PF1233 A和9-Deoxy-PF1233 B是一类由微生物代谢产生的生物碱,具有吗啉二酮的骨架结构。其中化合物Javanicunine A和Javanicunine B是由日本科学从爪哇正青霉(Eupenicilliumjavanicum)中分离得到(Heterocycles,2006,68,1969-1972),它们在生物体中的含量较低,它们的生物活性测试仅局限于抗菌活性的测定。化合物9-Deoxy-PF1233 A和9-Deoxy-PF1233 B由墨西哥科学从曲霉菌(Aspergillus sp.MEXU 27854)中分离得到(J.Nat.Prod.2017,80,2311-2318),它们在生物体中的含量也是较低,但是此类结构及衍生物对多药耐药糖蛋白(Pg-p)具有很好的抑制作用,其作用效果与目前的商品阳性药物维拉帕米相当。
鉴于天然来源的Javanicunine A,Javanicunine B,9-Deoxy-PF1233 A和9-Deoxy-PF1233 B在微生物体内含量较低,且分离纯化困难,不利于科研人员研究及应用开发。且至今为止,未见任何文献报到这类化合物的合成及大规模制备方法。因此,急需要开发Javanicunine A,Javanicunine B,9-Deoxy-PF1233 A和9-Deoxy-PF1233 B及其衍生物的合成方法。
发明内容
本发明为克服上述现有技术所述的缺陷,提供天然产物Javanicunine A或其衍生物的制备方法。
本发明的另一目的在于提供天然产物Javanicunine B或其衍生物的制备方法。
本发明的还一目的在于提供天然产物9-Deoxy-PF1233 B或其衍生物的制备方法。
本发明的还一目的在于提供天然产物9-Deoxy-PF1233 A或其衍生物的制备方法。
为解决上述技术问题,本发明采用的技术方案是:
天然产物Javanicunine A或其衍生物的制备方法,包括如下步骤:
S1.将式(Ⅰ)化合物通过傅克偶联反应生成式(Ⅱ)化合物;
S2.将式(Ⅱ)化合物脱去叔丁氧羰基BOC得式(Ⅲ)化合物;
S3.将式(Ⅲ)化合物与S-2-羟基-4-甲基戊酸进行酰胺化反应、酯交换反应生成吗啉二酮骨架,得到式(Ⅳ)化合物;
S4.对式(Ⅳ)化合物的仲胺进行乙酰化生成式(Ⅴ)化合物,式(Ⅴ)化合物为天然产物Javanicunine A或其衍生物;
其中R为氢原子、甲基或甲氧基。
R为氢原子时,制得产物为Javanicunine A。
本发明中,式(Ⅰ)化合物可市售得到,也可由本领域技术人员根据现有技术由L-色氨酸甲酯制备得到。
本发明提供的制备方法成功合成了Javanicunine A或其衍生物,能够大规模制备Javanicunine A及其衍生物,且总的反应步骤少,实施例中Javanicunine A的总收率能够达到20%以上。
优选地,步骤S1.中采用式(Ⅰ)化合物与三丁基-(3-甲基-2-丁烯基)-锡、碳酸铯、高氯酸银反应生成式(Ⅱ)化合物。
优选地,式(Ⅰ)化合物与三丁基-(3-甲基-2-丁烯基)-锡的摩尔比为1:(1~2)。
优选地,式(Ⅰ)化合物与碳酸铯的摩尔比为1:(1~2)。
优选地,三丁基-(3-甲基-2-丁烯基)-锡与高氯酸银的摩尔比为1:(1~2)。
优选地,步骤S1.中将式(Ⅰ)化合物与碳酸铯在在惰性气氛保护下溶解,然后-75~-80℃条件下加入三丁基-(3-甲基-2-丁烯基)-锡和高氯酸银,反应4~12h,生成式(Ⅱ)化合物。
优选地,步骤S2.中采用三甲基碘硅烷TMSI和N,N-二异丙基乙胺DIPEA脱去式(Ⅱ)化合物的BOC。
优选地,步骤S2.中将TMSI在-2~2℃条件下缓慢加入式(Ⅱ)化合物的溶液中,搅拌50~70min后,缓慢加入DIPEA,然后在室温下反应1~12h,式(Ⅱ)化合物脱去BOC。
优选地,步骤S3.以“一锅法”的方式进行。
优选地,步骤S3.中化学反应的催化剂为2-(7-氧化苯并三氮唑)-N,N,N',N'-四甲基脲六氟磷酸酯HATU、1-羟基-7-偶氮苯并三氮唑HOAT和N,N-二异丙基乙胺DIPEA。
优选地,步骤S3.中式(Ⅲ)化合物、S-2-羟基-4-甲基戊酸的摩尔比为1:(1.1~1.5)。
优选地,步骤S3.中式(Ⅲ)化合物与S-2-羟基-4-甲基戊酸反应8~16h,得到式(Ⅳ)化合物。
优选地,步骤S3.中式(Ⅲ)化合物与S-2-羟基-4-甲基戊酸在惰性气氛保护下,在-2~2℃条件下与HATU、HOAT和DIPEA混合,然后在75~85℃条件下反应12~16h,生成式(Ⅳ)化合物。
步骤S3.中通过HATU、HOAT和DIPEA催化式(Ⅲ)化合物与S-2-羟基-4-甲基戊酸反应,实现“一锅法”得到式(Ⅳ)化合物,即在一个操作步骤中实现酰胺化反应和酯化反应。“一锅法”能够有效节省操作步骤,提高生产效率。
优选地,步骤S4.中采用DIPEA催化式(Ⅳ)化合物与醋酸酐进行酰胺化反应生成式(Ⅴ)化合物。
优选地,式(Ⅳ)化合物与醋酸酐的摩尔比为1:(60~70)。
优选地,式(Ⅳ)化合物与DIPEA的摩尔比为1:(2~4)。
优选地,步骤S4.中式(Ⅳ)化合物、DIPEA和醋酸酐在50~70℃条件下反应10~14h,生成式(Ⅴ)化合物。
本发明同时保护天然产物Javanicunine B或其衍生物的制备方法,所述制备方法为将上述式(Ⅴ)化合物与六甲基二硅基胺基钾KHMDS和Davis氧化剂反应生成式(Ⅵ)化合物,式(Ⅵ)化合物为天然产物Javanicunine B或其衍生物;
其中R为氢原子、甲基或甲氧基。
R为氢原子时,制得产物为Javanicunine B。
优选地,式(Ⅴ)化合物、KHMDS、Davis氧化剂的摩尔比为1:(1~2):(1~2)。
优选地,所述制备方法为,在-75~80℃条件下,在惰性气氛保护下分别溶解KHMDS和式(Ⅴ)化合物,然后缓慢滴加混合,反应15~25min后,加入Davis氧化剂反应1.5~2.5h生成式(Ⅵ)化合物。
本发明同时保护天然产物9-Deoxy-PF1233 B或其衍生物的制备方法,包括如下步骤:
M1.将式(Ⅶ)化合物通过酰胺化反应生成式(Ⅷ)化合物;
M2.将式(Ⅷ)化合物进行酯交换反应生成吗啉二酮骨架,得到式(Ⅸ)化合物;
M3.将式(Ⅸ)化合物与二甲基过氧化酮DMDO反应得到式(Ⅹ)化合物,式(Ⅸ)化合物与二甲基过氧化酮的摩尔比为1:(2~3);式(Ⅹ)化合物为天然产物9-Deoxy-PF1233 B或其衍生物;
其中,R1和R2分别独立选自氢原子、甲基或甲氧基。
本发明中,式(Ⅶ)化合物可市售得到,也可由本领域技术人员根据现有技术由L-色氨酸甲酯制备得到。
R1和R2均为氢原子时,制得产物为9-Deoxy-PF1233 B。
上述制备方法中,二甲基过氧化酮的加入量对步骤M3.反应有重要影响,如果二甲基过氧化酮加入过少,则步骤M3.反应不彻底;如果二甲基过氧化酮加入过多,则步骤M3.反应的收率降低。
优选地,步骤M1.中采用HATU、HOAT和DIPEA催化式(Ⅶ)化合物与芳基乳酸进行酰胺化反应生成式(Ⅷ)化合物。
优选地,式(Ⅶ)化合物与芳基乳酸的摩尔比为1:(1.0~1.1)。
优选地,式(Ⅶ)化合物、HATU和DIPEA的摩尔比为1:(1.2~1.5):(5~7)。
HOAT采用催化量。
优选地,步骤M1.中式(Ⅶ)化合物与芳基乳酸在惰性气氛保护下,在-2~2℃条件下与HATU、HOAT和DIPEA混合,然后在75~85℃条件下反应2.5~3.5h,生成式(Ⅷ)化合物。
优选地,步骤M2.中化学反应的催化剂为对甲苯磺酸。
优选地,式(Ⅷ)化合物与对甲苯磺酸的摩尔比为1:(1.1~1.3)。
优选地,步骤M2.中式(Ⅷ)化合物与对甲苯磺酸溶解后在110~130℃条件下反应1.3~2.0h生成式(Ⅸ)化合物。
优选地,步骤M2.中反应结束后进行后处理,后处理包括萃取,萃取剂为二氯甲烷。
式(Ⅸ)化合物不可用乙酸乙酯萃取,可以选用用二氯甲烷萃取。
优选地,步骤M3.中式(Ⅸ)化合物与二甲基过氧化酮在惰性气体保护下,在-75~-80℃条件下生成天然产物9-Deoxy-PF1233 B或其衍生物。
二甲基过氧化酮采用丙酮为溶剂。
二甲基过氧化酮的丙酮溶液可根据现有技术制备得到。
优选地,所述惰性气体为氩气。
本发明还保护天然产物9-Deoxy-PF1233 A或其衍生物的制备方法,所述制备方法为将上述式(Ⅹ)化合物进行酯化反应生成式(Ⅻ)化合物;式(Ⅻ)化合物为天然产物9-Deoxy-PF1233 A或其衍生物;
其中,R1和R2分别独立选自氢原子、甲基或甲氧基。
R1和R2均为氢原子时,制得产物为9-Deoxy-PF1233 A。
优选地,所述制备方法为,以吡啶为溶剂,式(Ⅹ)化合物与过量的醋酸酐在4-二甲氨基吡啶DMAP催化下进行酯化反应生成式(Ⅻ)化合物;式(Ⅹ)化合物与DMAP的摩尔比为1:(0.9~1.1)。
发明人通过大量研究,通过改进现有的DMAP催化体系,得到上述DMAP催化酯化反应的方法。该方法能够提高产率,节省反应时间,提高效率。
优选地,式(Ⅹ)化合物与醋酸酐的摩尔比为1:(35~45)
优选地,所述式(Ⅹ)化合物、DMAP、吡啶和醋酸酐在75~85℃条件下反应10~14h生成式(Ⅻ)化合物。
优选地,所述惰性气氛为氮气气氛。
与现有技术相比,本发明的有益效果是:
本发明提供的制备方法能够大规模制备Javanicunine A,Javanicunine B,9-Deoxy-PF1233 A和9-Deoxy-PF1233 B及其衍生物,而且操作步骤少,其中,Javanicunine A的总收率能够达到20%以上,Javanicunine B的总收率能够达到10%以上,9-Deoxy-PF1233 A的总收率能够达到8%以上,9-Deoxy-PF1233 B的总收率能够达到12%以上。
具体实施方式
下面结合具体实施方式对本发明作进一步的说明。
实施例中的原料均可可通过市售得到;
本发明中:
TMSI是指三甲基碘硅烷;
BOC是指叔丁氧羰基;
HATU是指2-(7-氧化苯并三氮唑)-N,N,N',N'-四甲基脲六氟磷酸酯;
HOAT是指1-羟基-7-偶氮苯并三氮唑;
DIPEA是指N,N-二异丙基乙胺;
KHMDS是指六甲基二硅基胺基钾;
PTSA是指对甲苯磺酸;
DMAP是指4-二甲氨基吡啶;
DMDO是指二甲基过氧丙酮。
除非特别说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。
其中,本实施例中采用的试剂和仪器信息如下:
试剂:L-色氨酸甲酯、S-2-羟基-4-甲基戊酸、DMF、(S)-(-)-3-苯乳酸、对甲苯磺酸、氯仿、二氯甲烷、THF、BOP-Cl、碳酸钾、甲醇、石油醚、乙酸乙酯、HATU、HOAT等。
仪器:ABI Maldi-TOF和Qstar Elite高分辨质谱系统;Bruker Avance 400MHz核磁共振波谱仪(瑞士Bruker公司);Agilent GC-MS;EYLA(SB-1200)旋转蒸发仪(上海爱朗仪器有限公司);C-MAG HS 7磁力搅拌器(上海爱朗仪器有限公司);YUHUA(ZF-20D AN)暗箱式紫外分析仪(上海光豪分析仪器有限公司);KQ5200E型超声清洗器(昆山市超声仪器有限公司),SB-1200水浴锅(上海爱朗仪器有限公司),A-1000S水流抽气机(上海爱朗仪器有限公司)。
实施例1天然产物Javanicunine A的合成
1、式(Ⅱ)化合物(R=H)的合成
100mL圆底烧瓶中称取式(Ⅰ)化合物(R=H)(2.08g,4.19mmol)和碳酸铯(2.08g,6.40mmol),放入搅拌子,塞紧橡胶塞,抽真空。在氮气保护下加入无水二氯甲烷溶解,于-78℃下搅拌。15分钟后依次加入三丁基-(3-甲基-2-丁烯基)-锡(2.31g,6.40mmol)和高氯酸银(1.76g,8.50mmol)。5小时后加入饱和氯化铵溶液淬灭反应,过滤,滤液用二氯甲烷(100mL×2)和水(150mL)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=20:1),得到橙黄色油状物式(Ⅱ)化合物(R=H)(1.83g,90%);1H NMR(500MHz,CDCl3)δ7.33(s,1H),7.24(d,J=7.0Hz,1H),7.16(d,J=7.5Hz,1H),7.05(dd,J=7.5,7.0Hz,1H),6.16(s,1H),5.86(dd,J=17.5,10.5Hz,1H),5.08(d,J=10.5Hz,1H),5.00(d,J=17.5Hz,1H),3.80(dd,J=10.5,6.5Hz,1H),3.71(s,3H),2.38(dd,J=12.5,6.5Hz,1H),2.31–2.24(m,1H),1.55(s,9H),1.42(s,9H),1.02(s,3H),0.94(s,3H);13C NMR(125MHz,CDCl3)δ173.2,150.9,144.5,132.4,129.3,125.5,120.4,117.4,114.5,111.3,82.2,63.8,62.4,52.7,41.9,39.3,35.8,27.3,23.9,22.8,14.2;HRESIMS m/z487.2803[M+H]+,calcd for C27H39N2O6,487.2803.
步骤1的反应流程如下:
2、式(Ⅲ)化合物(R=H)的合成
100mL圆底烧瓶中称取式(Ⅱ)化合物(R=H)(1.26g,2.59mmol),抽真空后用氮气保护,加入乙腈(35mL)溶解,0℃下搅拌。缓慢滴加TMSI(1.8mL,12.58mmol),0℃下搅拌1小时。之后在缓慢滴加DIPEA(2.6mL,15.54mmol),室温下搅拌过夜。蒸干溶剂后用乙酸乙酯(50mL×2)和水(100mL)萃取,合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=3:1),得到橙黄色油状物式(Ⅲ)化合物(R=H)(653mg,88%);1H NMR(500MHz,CDCl3)δ7.13(d,J=7.5Hz,1H),7.05(dd,J=8.0,7.5Hz,1H),6.71(dd,J=8.0,7.5Hz,1H),6.56(d,J=8.0Hz,1H),6.00(dd,J=17.0,10.5Hz,1H),5.12–5.02(m,2H),5.01(s,1H),3.70(s,3H),3.62–3.54(m,2H),2.27(dd,J=11.5,5.0Hz,1H),2.15(t,J=11.5Hz,1H),1.11(s,3H),1.00(s,3H);13C NMR(125MHz,CDCl3)δ174.1,151.0,144.5,130.8,128.4,125.3,118.3,113.7,108.9,79.9,65.7,59.8,52.1,41.4,41.0,23.3,22.9;HRESIMSm/z 287.1750[M+H]+,calcdfor C17H23N2O2,287.1754.
步骤2的反应流程如下:
3、式(Ⅳ)化合物(R=H)的合成
50mL圆底烧瓶中称取式(Ⅲ)化合物(R=H)(550mg,1.92mmol)和S-2-羟基-4-甲基戊酸(305mg,2.31mmol),抽真空,加氮气保护。用DMF(10mL)溶解后0℃下搅拌10分钟,再称取HATU(1.02g,2.69mmol)和HOAT(8mg,0.06mmol)加入反应中。之后滴加DIPEA(1.9mL,11.54mmol)。80℃加热14小时。蒸干溶剂后用二氯甲烷(50mL×2)和水(100mL)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=7:1),得到橙黄色油状物式(Ⅳ)化合物(R=H)(368mg,52%);1H NMR(400MHz,CDCl3)δ7.16(d,J=7.6Hz,1H),7.11(td,J=7.6,1.2Hz,1H),6.77(td,J=7.2,2.0Hz,1H),6.58(d,J=7.6Hz,1H),5.97(dd,J=17.2,10.8Hz,1H),5.49(s,1H),5.16–5.05(m,3H),4.69(dd,J=9.6,2.4Hz,1H),4.06(dd,J=10.0,7.2Hz,1H),2.66–2.53(m,2H),1.97–1.88(m,2H),1.79(t,J=9.6Hz,1H),1.12(s,3H),1.00(s,3H),0.97(d,J=6.4Hz,3H),0.90(d,J=6.4Hz,3H);13C NMR(125MHz,CDCl3)δ168.9,165.9,149.6,143.2,129.1,128.6,124.9,119.1,114.9,109.6,77.8,77.6,61.8,57.6,40.8,37.8,36.0,23.9,23.3,22.8,22.5,21.2;HRESIMS m/z 369.2174[M+H]+,calcd forC22H29N2O3,369.2173.
步骤3的反应流程如下:
4、式(Ⅴ)化合物(R=H)的合成,即天然产物Javanicunine A
50mL圆底烧瓶中称取式(Ⅳ)化合物(R=H)(295mg,0.80mmol),依次加入DIPEA(0.4mL,2.40mmol)和醋酸酐(5mL,52.89mmol),60℃加热12小时。蒸干溶剂,用饱和碳酸氢钠水溶液(100mL)和二氯甲烷(50mL×2)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=6:1),得到淡黄色固体式(Ⅴ)化合物(R=H),即Javanicunines A(249mg,76%,总收率为22%);1H NMR(400MHz,CDCl3)δ7.99(s,1H),7.36–7.31(m,1H),7.29(d,J=7.6Hz,1H),7.16(dd,J=9.6,5.6Hz,1H),5.92(s,1H),5.79(dd,J=17.2,10.8Hz,1H),5.14(dd,J=14.0,10.8Hz,2H),4.69–4.63(m,1H),4.00(dd,J=10.8,6.4Hz,1H),2.70(dd,J=12.8,6.0Hz,1H),2.63(s,3H),2.53(dd,J=12.8,10.8Hz,1H),1.96–1.87(m,2H),1.79(t,J=10.0Hz,1H),1.16(s,3H),0.97(s,3H),0.94(d,J=6.0Hz,3H),0.89(d,J=6.0Hz,3H);13CNMR(100MHz,CDCl3)δ169.8,168.5,165.2,142.9,142.8,131.7,129.4,124.7,124.3,119.7,114.9,79.5,77.3,60.9,57.7,40.4,37.8,35.2,23.9,23.5,23.3,23.0,22.4,21.1;HRESIMS m/z 411.2279[M+H]+,calcd for C24H31N2O4,411.2278.
步骤4的反应流程如下:
实施例2天然产物Javanicunine B的合成
式(VI)化合物(R=H)的合成
5、化合物Javanicunines B的合成
取25mL圆底烧瓶,放入搅拌子,抽真空,加氮气保护。加入无水THF(4mL)后-78℃预冷,再抽取KHMDS(1mol/L in THF,0.17mL)加入其中。另取圆底烧瓶称取式(Ⅴ)化合物(R=H),即Javanicunines A(43mg,0.11mmol),塞紧橡胶塞后抽真空。用无水THF(4mL)溶解后逐滴加入反应中,-78℃搅拌20分钟。再另用圆底烧瓶称取Davis氧化剂(43mg,0.17mmol),抽真空后用无水THF(4mL)溶解,-78℃预冷后迅速加入反应体系中。2小时后加入饱和氯化铵水溶液淬灭反应,用乙酸乙酯(50mL×2)和水(100mL)萃取,合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=5:1),得到白色固体式(Ⅵ)化合物(R=H),即Javanicunines B(23mg,50%,总收率为11%);1H NMR(500MHz,CDCl3)δ8.09(s,1H),7.44(dd,J=8.0,7.5Hz,1H),7.39(d,J=7.5Hz,1H),7.24(dd,J=8.0,7.5Hz,1H),5.94(s,1H),5.76(dt,J=22.5,14.0Hz,1H),5.16(dd,J=22.5,14.0Hz,2H),5.02(d,J=9.5Hz,1H),2.96(d,J=14.0Hz,1H),2.71(d,J=14.0Hz,1H),2.63(s,3H),2.07(d,J=6.5Hz,1H),1.96–1.88(m,2H),1.78(t,J=10.0Hz,1H),1.15(s,3H),0.98(s,3H),0.96(d,J=5.5Hz,3H),0.91(d,J=5.5Hz,3H);13C NMR(125MHz,CDCl3)δ169.9,167.2,165.3,147.2,142.5,142.1,130.0,125.0,124.5,120.7,115.3,87.4,80.5,42.0,40.4,37.6,23.9,23.5,23.3,22.9,22.3,21.2;HRESIMSm/z 427.2225[M+H]+,calcd for C24H31N2O5,427.2227.
步骤5的反应流程如下:
实施例3天然产物9-Deoxy-PF1233 B的合成
6、式(Ⅷ)化合物(R1=H,R2=H)的合成
50mL圆底烧瓶中称取式(Ⅶ)化合物(R1=H,R2=H)(440mg,1.54mmol)和(S)-(-)-3-苯乳酸(261mg,1.57mmol),抽真空,加氮气保护。加入DMF(10mL)溶解后0℃下搅拌10分钟,再分别称取HATU(760mg,2.00mmol)和HOAT(10mg,0.08mmol)加入反应体系中。之后滴加DIPEA(1.5mL,9.23mmol)。80℃加热3小时。蒸干溶剂后用二氯甲烷(50mL×2)和水(100mL)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=5:1),得到淡黄色油状物式(Ⅷ)化合物(R1=H,R2=H)(421mg,63%);1H NMR(400MHz,CDCl3)δ8.12(s,1H),7.52(d,J=7.2Hz,1H),7.30(dd,J=6.8,1.3Hz,1H),7.27–7.20(m,2H),7.20–7.09(m,4H),6.17(dd,J=17.2,10.4Hz,1H),5.27–5.18(m,2H),4.97–4.86(m,1H),4.16(dt,J=8.4,4.0Hz,1H),3.62(s,3H),3.36(dd,J=14.4,6.8Hz,1H),3.20(dd,J=14.4,8.8Hz,1H),2.93(dd,J=14.0,4.0Hz,1H),2.72(d,J=4.8Hz,1H),2.29(dd,J=14.0,8.8Hz,1H),1.61(s,3H),1.59(s,3H);13C NMR(100MHz,CDCl3)δ172.9,172.6,145.8,140.6,137.0,134.2,129.9,129.5,128.5,126.8,121.6,119.5,118.2,112.3,110.6,105.4,72.8,53.1,52.4,40.2,39.1,28.1,27.7,27.6;HRESIMS m/z435.2272[M+H]+,calcd for C26H31N2O4,435.2278.
步骤6的反应流程如下:
7、式(Ⅸ)化合物(R1=H,R2=H)的合成
250mL圆底烧瓶中称取式(Ⅷ)化合物(R=H)(460mg,1.06mmol)和PTSA(242mg,1.27mmol),放入搅拌子,用甲苯(50mL)溶解后,120℃加热回流1.5小时。底物反应完全后,立即用水(100mL)和二氯甲烷(60mL×2)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=7:1),得到橙黄色晶体式(Ⅸ)化合物(R1=H,R2=H)(3.89g,65%);1H NMR(400MHz,CDCl3)δ8.10(s,1H),7.36(brs,4H),7.27(dd,J=8.8,7.6Hz,3H),7.16(dd,J=7.6,7.2Hz,1H),7.10(dd,J=7.6,7.2Hz,1H),6.05(dd,J=17.2,10.4Hz,1H),5.70(s,1H),5.13(dd,J=14.0,8.4Hz,2H),5.06–5.01(m,1H),4.36(dd,J=11.2,2.8Hz,1H),3.50(dd,J=14.0,3.6Hz,1H),3.39(dd,J=14.0,3.6Hz,1H),3.27(dd,J=14.4,6.0Hz,1H),2.62(dd,J=14.4,11.2Hz,1H),1.48(s,6H);13C NMR(100MHz,CDCl3)δ166.8,165.6,145.4,141.5,135.2,134.2,130.4,128.9,128.8,127.5,122.2,120.3,117.9,112.9,110.9,103.9,78.9,54.0,38.9,37.5,28.5,27.8,27.8;HRESIMS m/z 401.1874[M-H]-,calcdfor C25H25N2O3,401.1871.
步骤7的反应流程如下:
8、式(Ⅹ)化合物(R1=H,R2=H)的合成,即天然产物9-Deoxy-PF1233 B
50mL圆底烧瓶中称取式(Ⅸ)化合物(R1=H,R2=H)(29mg,0.07mmol),放入搅拌子,抽真空,加氩气保护。加入无水THF(5mL)溶解,置于-78℃搅拌10分钟。加入在-78℃中预冷的DMDO(自制0.08mmol/mL in acetone,2mL),TLC检测,原料反应完全后加入硫代硫酸钠水溶液淬灭反应,蒸干溶剂后用二氯甲烷(25mL×2)和水(50mL)萃取,合并浓缩有机层,加二氯甲烷(5mL)溶解后室温下搅拌过夜。蒸干溶剂,用硅胶柱进行纯化(PE:EtOAc=9:1),得到无色油状物式(Ⅹ)化合物(R1=H,R2=H),即9-Deoxy-PF1233 B(21mg,70%,总收率为12%);1H NMR(400MHz,CDCl3)δ7.29(d,J=7.6Hz,1H),7.25–7.14(m,5H),6.83(dd,J=8.0,7.6Hz,1H),6.68(d,J=8.0Hz,1H),6.37(dd,J=17.6,10.8Hz,1H),6.29(s,1H),5.24–5.09(m,2H),4.77(dd,J=8.8,3.6Hz,1H),4.34(dd,J=10.4,2.0Hz,1H),3.31(ddd,J=16.0,14.4,2.8Hz,2H),2.86(ddd,J=18.4,14.4,9.6Hz,2H),1.38(s,3H),1.36(s,3H);13C NMR(100MHz,CDCl3)δ167.4,166.1,147.7,143.9,136.1,130.9,129.5,129.4,128.5,126.9,124.7,120.6,113.8,111.0,94.7,87.9,78.5,57.1,44.9,36.8,34.8,25.8,23.3;HRESIMSm/z 419.1964[M+H]+,calcd for C25H27N2O4,419.1965.
步骤8的反应流程如下:
9、式(Ⅺ)化合物(R1=H,R2=H)的合成
50mL圆底烧瓶中称取式(Ⅸ)化合物(R1=H,R2=H)(30mg,0.07mmol),放入搅拌子,抽真空,加氩气保护。加入无水THF(5mL)溶解,置于-78℃搅拌10分钟。加入在-78℃中预冷的DMDO(自制0.08mmol/mL in acetone,3mL),-78℃搅拌过夜。加入硫代硫酸钠水溶液淬灭反应,蒸干溶剂后用二氯甲烷(25mL×2)和水(50mL)萃取,合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=9:1),得到无色油状物式(Ⅺ)化合物(R1=H,R2=H)(21mg,66%);1H NMR(500MHz,CDCl3)δ7.35–7.25(m,5H),7.24–7.18(m,2H),6.85(dd,J=8.0,7.5Hz,1H),6.75(d,J=8.0Hz,1H),6.24(s,1H),6.22(dd,J=14.5,6.5Hz,1H),5.05(dd,J=14.5,6.5Hz,2H),4.72(dd,J=7.5,3.5Hz,1H),3.77(dd,J=11.0,7.5Hz,1H),3.42(dd,J=15.0,3.5Hz,1H),3.11(dd,J=15.0,7.5Hz,1H),2.85(dd,J=13.0,11.0Hz,1H),2.70(dd,J=13.0,7.5Hz,1H),2.32(s,1H),1.17(s,6H);13C NMR(125MHz,CDCl3)δ170.1,167.6,148.7,143.6,135.8,131.1,129.9,129.5,128.4,127.1,123.7,120.3,113.9,111.4,91.9,88.8,80.4,56.9,44.8,35.9,35.5,26.4,22.9;HRESIMS m/z419.1969[M+Na]+,calcd for C25H27N2O4,419.1965.
步骤9的反应流程如下:
实施例4天然产物9-Deoxy-PF1233 A的合成
式(Ⅻ)化合物(R1=H,R2=H)的合成,
10、化合物9-Deoxy-PF1233 A的合成
25mL圆底烧瓶中称取式(Ⅹ)化合物(R1=H,R2=H),即9-Deoxy-PF1233 B(15mg,0.04mmol)和DMAP(5mg,0.04mmol),依次加入吡啶(2.5mL,27.30mmol)和醋酸酐(0.15mL,1.59mmol),80℃下加热12小时。蒸干溶剂,用碳酸氢钠水溶液(50mL)和二氯甲烷(25mL×2)萃取。合并浓缩有机层,用硅胶柱进行纯化(PE:EtOAc=9:1),得到淡黄色油状物式(Ⅻ)化合物(R1=H,R2=H),即9-Deoxy-PF1233 A(11mg,68%,总收率为8%);1H NMR(400MHz,CDCl3)δ7.62(d,J=7.6Hz,1H),7.25–7.11(m,6H),6.78(dd,J=8.0,7.6Hz,1H),6.67(d,J=8.0Hz,1H),6.32(dd,J=8.0,7.6Hz,1H),6.28(d,J=12.0Hz,1H),5.14(dd,J=20.0,12.0Hz,2H),4.74(dd,J=8.8,3.2Hz,1H),4.37(d,J=9.6Hz,1H),4.20(d,J=14.0Hz,1H),3.32(dd,J=14.0,3.2Hz,1H),2.83(ddd,J=24.0,14.0,9.6Hz,2H),1.99(s,3H),1.43(s,3H),1.36(s,3H);13C NMR(100MHz,CDCl3)δ168.7,167.0,166.0,148.6,144.0,136.0,131.2,129.5,128.6,128.5,126.9,125.6,120.4,112.8,110.9,98.3,91.1,78.4,58.4,45.3,34.9,34.6,25.5,24.9,21.6;HRESIMS m/z461.2077[M+H]+,calcd for C27H29N2O5,461.2071.
步骤10的反应流程如下:
显然,本发明的上述实施例仅仅是为清楚地说明本发明所作的举例,而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明权利要求的保护范围之内。
Claims (2)
1.天然产物9-Deoxy-PF1233A或其衍生物的制备方法,其特征在于,包括如下步骤:
M1.将式(Ⅶ)化合物通过酰胺化反应生成式(Ⅷ)化合物;
M2.将式(Ⅷ)化合物进行酯交换反应生成吗啉二酮骨架,得到式(Ⅸ)化合物;
M3.将式(Ⅸ)化合物与二甲基过氧化酮DMDO反应得到式(Ⅹ)化合物,式(Ⅸ)化合物与二甲基过氧化酮的摩尔比为1:(2~3);
M4.制得的式(Ⅹ)化合物进行酯化反应生成式(Ⅻ)化合物;式(Ⅻ)化合物为天然产物9-DeoxyPF1233 A或其衍生物;以吡啶为溶剂,式(Ⅹ)化合物与过量的醋酸酐在4-二甲氨基吡啶DMAP催化下进行酯化反应生成式(Ⅻ)化合物;式(Ⅹ)化合物与DMAP的摩尔比为1:(0.9~1.1);
其中,R1和R2分别独立选自氢原子、甲基或甲氧基;
2.根据权利要求1所述的制备方法,其特征在于,式(Ⅹ)化合物与醋酸酐的摩尔比为1:(10~50)。
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Total syntheses and stereochemical reassignments of mollenines A and B;Shinya Shiomi等;《Bioorganic & Medicinal Chemistry Letters》;20180202;第2767页 * |
Total synthesis and absolute configuration reassignment of mollenines A and B Supporting Information;Ming-Zhong Wang等;《Org. Chem. Front.》;20171218;第8-9页 * |
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