CN103626687B - 一种(3r)-1-[(r)-1-苯乙基]-3-羟甲基吡咯烷的合成方法 - Google Patents
一种(3r)-1-[(r)-1-苯乙基]-3-羟甲基吡咯烷的合成方法 Download PDFInfo
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Abstract
本发明公开一种(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的合成方法,包括将氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷混合反应得到(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,所述反应是在四氢呋喃溶剂中进行,且氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的摩尔比为(1~1.5):1,反应温度为25~65℃,反应时间为15~24小时。在本发明的条件下,反应产物(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的收率可高达87~98%,节省了原料成本。
Description
技术领域
本发明医药中间体合成领域,具体涉及一种(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的合成方法。
背景技术
(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷是重要的医药中间体,专利文献WO2011/019090A1公开了一种合成(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的方法,其合成路线如下:
。
在步骤(2)中,其用氢化铝锂在环戊基甲基醚溶剂中将(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷还原成(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的摩尔比达2.1:1,然而,反应产物的粗得率也只能达到57%,且成本高。
发明内容
本发明的目的是对上述方法进行改进,以提高(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的收率,降低成本。
本发明实现上述目的所采用的技术方案如下:
一种(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的合成方法,包括将氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷混合反应得到(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,其特点在于,所述反应是在四氢呋喃溶剂中进行,且氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的摩尔比为(1~1.5):1,反应温度为25~65℃,反应时间为15~24小时。
进一步,所述氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的摩尔比为1.25:1,反应温度为65℃,反应时间为20小时。
反应液中,(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的浓度一般可控制在0.05~0.1mol/L。优选地为0.07~0.08mol/L。
有益效果:本发明对现有氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷反应条件进行改进,在本发明的条件下,即使经过纯化后,反应产物(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的收率也能高达87~98%,远高于现有的57%的收率,而氢化铝锂的当量也只需控制在1~1.5eq,也远低于现有的2.1eq,节约了原料成本。
附图说明
图1为实施例1所得(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的HNMR图谱。
具体实施方式
以下结合实施例和附图对本发明做进一步详细说明。
实施例1
合成过程如下:
。
R-(+)-苯乙胺(30.0g,0.25mol,1.0eq)和衣康酸二甲酯(40g,0.25mol,1eq)混合,145℃下回流4h,反应结束后,柱层析分离(依次用体积比为30:1:1、20:1:1和5:1:1的石油醚、乙酸乙酯、二氯甲烷混合液洗脱),得(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷(化合物2)20g,收率32%。
将800mL四氢呋喃(THF)降温至0℃时,慢慢加入氢化铝锂(3.8g,0.1mol,1.25eq),待全部溶解后,慢慢滴入(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷(20g,0.08mol,1eq)的THF(200mL)溶液,0℃下搅拌10min后升温至65℃回流20h,停止反应,在0℃下滴加2mol/LNaOH水溶液,滤掉白色沉淀物,用1200mLTHF洗涤白色沉淀物,合并有机相,蒸除THF,加入1500mL水,用4L二氯甲烷(DCM)萃取。蒸除有机溶剂,得浅黄色油状产物16g,即为(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷(化学结构如化合物3),收率97.56%。
化合物3的HNMR图谱如图1所示:产物结构中含有十组氢原子,且其化学位移与产品结构吻合,化学位移在7.261-7.317ppm处的多重峰为1位苯乙基的苯环上的H峰,3.61ppm处的多重峰为3位羟甲基的CH2的H峰,3.15ppm处的多重峰为1位苯乙基的CH的H峰,2.96ppm处的多重峰为3位CH的H峰和OH的H峰,2.43ppm处的多重峰位5位CH2的H峰,2.29ppm处的多重峰位2位CH2的H峰,1.90ppm处的多重峰位4位CH2的H峰,1.40处的双峰位1位苯乙基的CH3的H峰。
实施例2
R-(+)-苯乙胺(30.0g,0.25mol,1.0eq)和衣康酸二甲酯(40g,0.25mol,1eq)混合,145℃下回流2h,反应结束后,柱层析分离(依次用体积比为30:1:1、20:1:1和5:1:1的石油醚、乙酸乙酯、二氯甲烷混合液洗脱),得(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷18g,收率29.15%。
将800mLTHF降温至0℃时,慢慢加入氢化铝锂(2.774g,0.073mol,1eq),待全部溶解后,慢慢滴入(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷(18g,0.073mol,1eq)的THF(200mL)溶液,0℃下搅拌10min后升温至25℃反应15h,停止反应,在0℃下滴加2mol/LNaOH水溶液,滤掉白色沉淀物,用1200mLTHF洗涤白色沉淀物,合并有机相,蒸除THF,加入1500mL水,用4LDCM萃取。蒸除有机溶剂,得浅黄色油状产物13.2g,即为(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,收率88.21%。
实施例3
R-(+)-苯乙胺(30.0g,0.25mol,1.0eq)和衣康酸二甲酯(40g,0.25mol,1eq)混合,145℃下回流8h,反应结束后,柱层析分离(依次用体积比为30:1:1、20:1:1和5:1:1的石油醚、乙酸乙酯、二氯甲烷混合液洗脱),得(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷18.7g,收率30.28%。
将800mLTHF降温至0℃时,慢慢加入氢化铝锂(4.332g,0.114mol,1.5eq),待全部溶解后,慢慢滴入(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷(18.7g,0.076mol,1eq)的THF(200mL)溶液,0℃下搅拌10min后升温40℃反应24h,停止反应,在0℃下滴加2MNaOH水溶液,滤掉白色沉淀物,用1200mLTHF洗涤白色沉淀物,合并有机相,蒸除THF,加入1500mL水,用4LDCM萃取。蒸除有机溶剂,得浅黄色油状产物13.7g,即为(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,收率87.93%。
Claims (1)
1.一种(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷的合成方法,包括将氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷混合反应得到(3R)-1-[(R)-1-苯乙基]-3-羟甲基吡咯烷,其特征在于:所述反应是在四氢呋喃溶剂中进行,且氢化铝锂与(3R)-1-[(R)-1-苯乙基]-3-羧酸甲酯-5-氧代吡咯烷的摩尔比为1.25:1,反应温度为65℃,反应时间为20小时。
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US5281612A (en) * | 1982-09-09 | 1994-01-25 | Warner-Lambert Company | Naphthyridine antibacterial agents |
EP0153163A2 (en) * | 1984-02-17 | 1985-08-28 | Warner-Lambert Company | 7-Substituted-1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acids; 7-substituted-1-cyclopropyl-1,4-dihydro-6-fluoro-4-oxo-1,8-naphthyridine-3-carboxylic acids; their derivatives; and a process for preparing the compounds |
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