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Correction to Economical Process for Preparation of 19-nor A Ring of Paricalcitol from (−)-Shikimic Acid
Organic Process Research & Development ( IF 3.4 ) Pub Date : 2020-05-26 , DOI: 10.1021/acs.oprd.0c00107
Shengfeng Zhou , Runyu Zhu , Jingwen Hu , Lixiong Zhang , Qian Lu , Xinhong Yu

The procedure of the preparation of compounds 15 and 16 was omitted in the experimental section in the paper. (1S,3R,4S,5R)-3,5-Bis[(tert-butyl)dimethylsilyloxy]-4-imidazolyl Thiocabonyl Oxy-cyclohex-1-carboxylic Acid Methyl Ester (15) and (3R,5R)-3,5-Bis[(tert-butyl)dimethylsilyloxy]-cyclohex-1-carboxylic Acid Methyl Ester (16). 1,1-Thiocarbonyldiimidazole (1.28 kg, 7.2 mol), DMAP (8.5 g, 0.07 mol), and imidazol (408 g, 6 mol) were added to the solution of 14 (2512 g, 6.0 mol) in methylene chloride (20 kg). The reaction mixture was stirred at 20–25 °C for 12 h. After the in-process control (TLC n-hexane/ethyl acetate 10:1) showed no starting material, the mixture was quenched with sat NH4Cl solution (10 kg). The DCM layer was separated and concentrated to give crude thiocarbaimidazole 15. Degassed 2-methoxyethanol (20 kg) was added to dissolve crude thiocarbaimidazole 15. Sodium hypophosphite (3.18 kg, 30 mol), AIBN (197 g, 1.2 mol), and triethylamine (0.3 kg, 3 mol) were added to the solution. The mixture was heated slowly with stirring to 110–120 °C and kept at this temperature for 2 h under nitrogen. After the in-process control (TLC n-hexane/AcOEt 10:1) showed no starting material, the reaction mixture was concentrated. The residue was further purified by column chromatography (heptane/AcOEt, 100:1 to 100:5) to give (1.47 kg, 3.66 mol) 16 in 65% yield (over 2 steps). Spectral data of 15: 1H NMR (400 MHz, CDCl3) δ: 8.36 (S, 1H), 7.63 (S, 1H), 7.05 (S, 1H), 5.49 (m, 1H), 4.31 (m, 1H), 4.26 (m, 1H), 3.73 (S, 3H), 2.87 (m, 1H), 2.08 (m, 1H), 1.7–1.9 (m, 3H), 0.92 (s, 9H), 0.81 (s, 9H), 0.01–0.17 (m, 12H); 13C NMR (100 MHz, CDCl3) δ: 184.1, 174.8, 136.9, 130.7, 117.8, 82.9, 66.7, 66.5, 51.8, 35.6, 32.9, 31.2, 25.6, 25.5, 17.8, −4.9, −4.9, −5.1; ESIMS: 529 (M + H)+. [a]D20 −32.9 (c 1.1, MeOH). Spectral data of 16: 1H NMR (400 MHz, CDCl3) δ: 4.21 (m, 1H), 4.04 (m, 1H), 3.67 (S, 3H), 2.11 (m, 1H), 1.86 (m, 2H), 1.31–1.58 (m, 3H), 0.88 (m, 18H), 0.04 (m, 12H); 13C NMR (100 MHz, CDCl3) δ: 175.8, 67.0, 66.4, 51.5, 42.6, 37.9, 36.6, 35.2, 25.8, 25.7, 18.1, 17.9, −4.7, −4.8, −5.1; ESIMS: 403 (M + H)+. [a]D20 −10.9 (c 1.07, MeOH). This article has not yet been cited by other publications.

中文翻译:

由(-)-ki草酸制备19-nor A环烷醇的经济方法的校正

本文实验部分省略了化合物1516的制备过程。(1 S,3 R,4 S,5 R)-3,5-双[(丁基)二甲基甲硅烷氧基] -4-咪唑基硫代羰基氧基-环己-1-羧酸甲酯(15 R)和(3 R, 5 R)-3,5-双[(丁基)二甲基甲硅烷氧基]-环己基-1-羧酸甲酯(16)。14的溶液中添加1,1-硫代羰基二咪唑(1.28 kg,7.2 mol),DMAP(8.5 g,0.07 mol)和咪唑(408 g,6 mol)(2512g,6.0mol)的二氯甲烷(20kg)溶液。将反应混合物在20–25°C下搅拌12 h。过程中的控制后(TLC Ñ己烷/乙酸乙酯10:1)显示无起始物质,用饱和NH淬灭该混合物4 Cl溶液(10千克)。分离DCM层并浓缩,得到粗制硫代碳杂咪唑15。加入脱气的2-甲氧基乙醇(20kg)以溶解粗制硫代氨基咪唑15。将次磷酸钠(3.18 kg,30 mol),AIBN(197 g,1.2 mol)和三乙胺(0.3 kg,3 mol)添加到溶液中。将混合物在搅拌下缓慢加热至110–120°C,并在氮气下保持该温度2小时。在过程控制后(TLC n-己烷/ AcOEt 10:1)显示没有起始原料,将反应混合物浓缩。将残余物通过柱色谱法(庚烷/ AcOEt,100:1至100:5)进一步纯化,以65%的产率(2步)得到(1.47kg,3.66mol)16151 H NMR(400 MHz,CDCl 3)的光谱数据δ:8.36(S,1H),7.63(S,1H),7.05(S,1H),5.49(m,1H),4.31(m,1H ),4.26(m,1H),3.73(S,3H),2.87(m,1H),2.08(m,1H),1.7–1.9(m,3H),0.92(s,9H),0.81(s, 9H),0.01-0.17(m,12H);13 C NMR(100 MHz,CDCl 3)δ:184.1,174.8,136.9,130.7,117.8,82.9,66.7,66.5,51.8,35.6,32.9,31.2,25.6,25.5,17.8,-4.9,-4.9,-5.1 ; ESIMS:529(M + H)+。[a] D20 -32.9(c 1.1,MeOH)。161 H NMR(400 MHz,CDCl 3)的光谱数据δ:4.21(m,1H),4.04(m,1H),3.67(S,3H),2.11(m,1H),1.86(m,2H ),1.31-1.58(m,3H),0.88(m,18H),0.04(m,12H);13 C NMR(100MHz,CDCl 3)δ:175.8、67.0、66.4、51.5、42.6、37.9、36.6、35.2、25.8、25.7、18.1、17.9,-4.7,-4.8,-5.1;ESIMS:403(M + H)+。[a] D 20 -10.9(c 1.07,MeOH)。本文尚未被其他出版物引用。
更新日期:2020-06-19
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