CN107987096B - 一种合成2-醛基呋喃-4-硼酸频那醇酯的方法 - Google Patents
一种合成2-醛基呋喃-4-硼酸频那醇酯的方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- KTBLRYUFNBABGO-UHFFFAOYSA-N 2-(furan-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound O1C(C)(C)C(C)(C)OB1C1=COC=C1 KTBLRYUFNBABGO-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 230000002194 synthesizing effect Effects 0.000 title claims abstract description 10
- IVDFJHOHABJVEH-UHFFFAOYSA-N pinacol Chemical compound CC(C)(O)C(C)(C)O IVDFJHOHABJVEH-UHFFFAOYSA-N 0.000 claims abstract description 28
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 claims abstract description 27
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims abstract description 18
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000031709 bromination Effects 0.000 claims abstract description 4
- 238000005893 bromination reaction Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 3
- -1 boron halide Chemical class 0.000 claims description 2
- CHNLPLHJUPMEOI-UHFFFAOYSA-N oxolane;trifluoroborane Chemical compound FB(F)F.C1CCOC1 CHNLPLHJUPMEOI-UHFFFAOYSA-N 0.000 claims description 2
- 238000010511 deprotection reaction Methods 0.000 claims 1
- 230000007062 hydrolysis Effects 0.000 claims 1
- 238000006460 hydrolysis reaction Methods 0.000 claims 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims 1
- 235000017557 sodium bicarbonate Nutrition 0.000 claims 1
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 abstract description 8
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052794 bromium Inorganic materials 0.000 abstract description 6
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 abstract description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001308 synthesis method Methods 0.000 abstract description 3
- GLFAEFVIKYUOJK-UHFFFAOYSA-N [B].[Cl] Chemical compound [B].[Cl] GLFAEFVIKYUOJK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- YHEMDDZDHYKQGZ-UHFFFAOYSA-N 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)furan-2-carbaldehyde Chemical compound O1C(C)(C)C(C)(C)OB1C1=COC(C=O)=C1 YHEMDDZDHYKQGZ-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 3
- 150000001241 acetals Chemical class 0.000 description 3
- 238000004440 column chromatography Methods 0.000 description 3
- KLKFAASOGCDTDT-UHFFFAOYSA-N ethoxymethoxyethane Chemical compound CCOCOCC KLKFAASOGCDTDT-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 2
- KZMGYPLQYOPHEL-UHFFFAOYSA-N Boron trifluoride etherate Chemical compound FB(F)F.CCOCC KZMGYPLQYOPHEL-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 125000003172 aldehyde group Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 150000002466 imines Chemical class 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000002390 rotary evaporation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- BMQDAIUNAGXSKR-UHFFFAOYSA-N (3-hydroxy-2,3-dimethylbutan-2-yl)oxyboronic acid Chemical compound CC(C)(O)C(C)(C)OB(O)O BMQDAIUNAGXSKR-UHFFFAOYSA-N 0.000 description 1
- LXWLEQZDXOQZGW-UHFFFAOYSA-N 3-bromofuran Chemical class BrC=1C=COC=1 LXWLEQZDXOQZGW-UHFFFAOYSA-N 0.000 description 1
- 238000006069 Suzuki reaction reaction Methods 0.000 description 1
- KYOIPUDHYRWSFO-UHFFFAOYSA-N [Br].[Li] Chemical group [Br].[Li] KYOIPUDHYRWSFO-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- UNXISIRQWPTTSN-UHFFFAOYSA-N boron;2,3-dimethylbutane-2,3-diol Chemical compound [B].[B].CC(C)(O)C(C)(C)O UNXISIRQWPTTSN-UHFFFAOYSA-N 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 239000012450 pharmaceutical intermediate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- GKASDNZWUGIAMG-UHFFFAOYSA-N triethyl orthoformate Chemical compound CCOC(OCC)OCC GKASDNZWUGIAMG-UHFFFAOYSA-N 0.000 description 1
- NHDIQVFFNDKAQU-UHFFFAOYSA-N tripropan-2-yl borate Chemical compound CC(C)OB(OC(C)C)OC(C)C NHDIQVFFNDKAQU-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/04—Esters of boric acids
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
本发明公开了一种合成2‑醛基呋喃‑4‑硼酸频那醇酯的方法。以糠醛为原料,在高氯酸存在下与四氢吡咯反应,接着NBS溴化,最后与金属锂和氯‑硼试剂反应,加入频那醇后得到2‑醛基呋喃‑4‑硼酸频那醇酯。该方法中定位效果好,解决了以往合成方法中需要大量三氯化铝与溴素反应得到2‑醛基‑4,5‑二溴呋喃,随后与丁基锂反应去掉5位溴后才能得到2‑醛基‑4‑溴呋喃,适合工业化放大生产。
Description
技术领域
本发明涉及一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,属于药物中间体合成领域。
背景技术
2-醛基呋喃-4-硼酸频那醇酯,又称为5-醛基呋喃-3-硼酸频哪醇酯,白色晶状固体,英文名:4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan -2-yl)furan-2-carbaldehyde或5-Formylfuran-3-boronic acid pinacol ester,CAS:846023-58-3。
2-醛基呋喃-4-硼酸频那醇酯的合成关键在于2-醛基-4-溴呋喃的制备上。关于该中间体市场上几乎无法大量供应,仅有试剂公司少量提供。文献中的合成方法仅有:采用糠醛与2.2当量三氯化铝和2当量溴素室温反应,冰水淬灭后柱层析得到4,5-二溴-2-醛基呋喃,随后与4当量原甲酸三乙酯反应保护醛基成缩醛,收率98%,随后超低温下加入1当量的正丁基锂去掉5位溴,柱层析后得到2-缩乙醛-4-溴呋喃,收率73%。取得该中间体后,超低温下再次与正丁基锂发生溴锂交换,与硼酸三异丙酯反应后,得到保护的4-位硼酸;或者再金属钯催化下与联硼酸频那醇酯发生Suzuki偶联生成保护的4-位硼酸频那醇酯。
以上合成方法步骤过于繁琐,产生大量含铝酸性废水,需要柱层析纯化,超低温反应或是采用相对成本较高的金属钯偶联。同时在实际进行该路线公斤级放大时,按照上述文献方法,需要增加至3-4当量三氯化铝才能促使反应彻底,以上因素都制约了工艺的进一步放大。
发明内容
为了克服上述缺陷,本发明提供了一种合成2-醛基呋喃-4-硼酸频那醇酯的方法。以糠醛为原料,在高氯酸存在下与四氢吡咯反应,接着NBS溴化,最后与金属锂和氯-硼试剂反应,加入频那醇后得到 2-醛基呋喃-4-硼酸频那醇酯。
一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,其特征在于,包括以下步骤:以糠醛为原料,在高氯酸存在下与四氢吡咯反应,接着 NBS溴化,最后与金属锂和卤-硼试剂反应,加入频那醇,水解脱保护后得到2-醛基呋喃-4-硼酸频那醇酯。
反应方程式如下:
在上述步骤中,所述糠醛、高氯酸与四氢吡咯摩尔比为 1:1-1.2:1-1.5。
在上述步骤中,所述NBS溴化时,加入1-1.5当量NBS和0.05-0.15 当量BF3-Et2O、BF3-THF、BF3-CH3CN,温度在80-120℃。
在上述步骤中,所述4-溴呋喃盐、金属锂、卤硼试剂摩尔比为 1:2-2.2:1-1.1。
在上述步骤中,所述卤硼选自ClB(NiPr2)2、BrB(NiPr2)2、ClB(NMe2)2、BrB(NMe2)2、ClB(C4H8N)2或BrB(C4H8N)2。其中,C4H8N 为吡咯烷。
在上述步骤中,频那醇与卤硼试剂摩尔比为1:0.95-1。在与卤硼试剂反应后,先淬灭再加入频那醇成酯时,频那醇当量需要严格控制,当频那醇过量时,与2-位醛基也会反应生成缩醛,一旦生成后,就很难水解。因此采用先加入频那醇与胺交换后,再水解掉醛基保护剂,避免了此问题。
发明的有益效果
方法中定位效果好,解决了以往合成方法中需要大量三氯化铝与溴素反应得到2-醛基-4,5-二溴呋喃,随后与丁基锂反应去掉5位溴后才能得到2-醛基-4-溴呋喃,适合工业化放大生产。
具体实施方案
实施例1
在接有分水装置的三口反应瓶内,加入糠醛(19.2g,0.2mol)和四氢吡咯(14.2g,0.2mol)和甲苯250mL,搅拌均匀后,开始滴加70-72%高氯酸(28.6g,0.2mol)与二氧六环60mL混合溶液,滴加过程中保持快速搅拌,滴加完毕后,升温至回流反应开始分水,保持回流状态至不再有水继续分出时,降温减压蒸干溶剂,得到黄色油状物,加入无水冷乙醇230mL后搅拌下析出,过滤,得到浅黄色固体盐45.9g,收率95%,HNMR(DMSO-d6,400MHz):8.74(s,1H),7.85(d,1H),6.52-6.54 (m,2H),3.78-4.39(m,4H),2.05-2.44(m,4H).
将上述固体盐,加入乙腈650mL中,随后加入NBS(46.3,0.26mol) 和催化量BF3-CH3CN(12mmol),升温至回流反应,TLC检测反应结束。旋蒸溶剂后,加入二乙氧基甲烷550mL,静置分层,有机层水洗两次,饱和食盐水洗,无水硫酸钠干燥,滤液蒸干后,加入MTBE和乙醇重结晶后得到浅黄色固体54.3g,收率87%,HNMR(DMSO-d6,400MHz): 8.63(s,1H),7.81(s,1H),6.55(m,1H),3.78-4.39(m,4H),2.05-2.44(m,4H).
在反应瓶内,加入金属锂(1.52g,0.22mol)、ClB(NMe2)2(16.9g, 95%含量,0.12mol)和60mL无水THF混合溶液中,滴加入上步溴代物(32.8g,0.1mol)和330mL无水THF混合溶液。刚开始滴加时,有明显放热,表明反应已经开始启动。滴加过程中保温在-10℃至0℃,滴加入完毕后,保温搅拌过夜。直至次日间隔1小时取样,反应不再继续进行时停止。
反应液停止搅拌,硅藻土过滤,得到的溶液,加入频那醇(14.2g, 0.12mol)后,开始缓慢升温,升温过程中逐渐有二甲胺气体溢出,待不在有碱性气体溢出时,停止反应,加入过量饱和碳酸氢钠溶液淬灭,检测反应亚胺水解完全,分层将溶液蒸干,加入乙酸乙酯和庚烷打浆后,得到白色晶状固体14.7g,收率66%,HNMR(CDCl3,400MHz): 9.68(s,1H),8.22(s,1H),7.49(s,1H),1.26(s,12H).
实施例2
在接有分水装置的三口反应瓶内,加入70-72%高氯酸(28.6g, 0.2mol)、四氢吡咯(14.2g,0.2mol)和甲苯250mL,升温回流下,分至不再有水生成。接着将糠醛(19.2g,0.2mol)和二氧六环60mL混合溶液加入,随后升温至回流反应继续分水,保持回流状态至不再有水继续分出时,降温减压蒸干溶剂,得到黄色油状物,加入无水冷乙醇230mL后搅拌下析出,过滤,得到浅黄色固体盐44.9g,收率93%, HNMR(DMSO-d6,400MHz):8.74(s,1H),7.85(d,1H),6.52-6.54(m,2H), 3.78-4.39(m,4H),2.05-2.44(m,4H).
将上述固体盐,加入乙腈650mL,随后加入NBS(42.9g,0.24mol) 和催化量BF3-Et2O(12mmol),升温至回流反应,TLC检测反应结束。旋蒸溶剂后,加入2-MeTHF550mL,静置分层,有机层水洗两次,饱和食盐水洗,无水硫酸钠干燥,滤液蒸干后,加入MTBE和乙醇重结晶后得到浅黄色固体51.3g,收率84%,HNMR(DMSO-d6,400MHz): 8.63(s,1H),7.81(s,1H),6.55(m,1H),3.78-4.39(m,4H),2.05-2.44(m,4H).
在反应瓶内,加入金属锂(1.66g,0.24mol)、ClB(NMe2)2(18.3g, 95%含量,0.13mol)和60mL二乙氧基甲烷混合溶液中,滴加入上步溴代物(32.8g,0.1mol)和350mL二乙氧基甲烷混合溶液。刚开始滴加时,有明显放热,表明反应已经开始启动。滴加过程中保温在 -10℃至0℃,滴加入完毕后,保温搅拌过夜。直至次日间隔1小时取样,反应不再继续进行时停止。
反应液停止搅拌,硅藻土过滤,得到的溶液,加入频那醇(14.2g, 0.12mol)后,开始缓慢升温,升温过程中逐渐有二甲胺气体溢出,待不在有碱性气体溢出时,停止反应,加入过量饱和碳酸氢钠溶液淬灭,检测反应亚胺水解完全,分层将溶液蒸干,加入乙酸乙酯和庚烷打浆后,得到白色晶状固体13.8g,收率62%,HNMR(CDCl3,400MHz): 9.68(s,1H),8.22(s,1H),7.49(s,1H),1.26(s,12H)。
Claims (4)
1.一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,其特征在于,包括以下步骤:以糠醛为原料,在高氯酸存在下与四氢吡咯回流分水反应,接着NBS溴化得到4-溴呋喃-2-亚甲基-1-吡咯烷高氯酸嗡盐,最后将4-溴呋喃-2-亚甲基-1-吡咯烷高氯酸嗡盐溶液加入金属锂和卤硼试剂混合体系中反应后,加入频那醇,碳酸氢钠水解脱保护得到2-醛基呋喃-4-硼酸频那醇酯,反应方程式表示为:
所述卤硼试剂选自ClB(Ni-Pr2)2、BrB(Ni-Pr2)2、ClB(NMe2)2、BrB(NMe2)2、ClB(C4H8N)2或BrB(C4H8N)2;所述NBS溴化时,加入1-1.5当量NBS和0.05-0.15当量BF3-Et2O、BF3-THF或BF3-CH3CN,温度在80-120℃。
2.根据权利要求1所述一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,其特征在于:糠醛、高氯酸与四氢吡咯摩尔比为1:1-1.2:1-1.5。
3.根据权利要求1所述一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,其特征在于:所述4-溴呋喃-2-亚甲基-1-吡咯烷高氯酸嗡盐、金属锂、卤硼试剂摩尔比为1:2-2.2:1-1.1。
4.根据权利要求1所述一种合成2-醛基呋喃-4-硼酸频那醇酯的方法,其特征在于:频那醇与卤硼试剂摩尔比为1:0.95-1。
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