* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
5 kg (ie 42.7 mol) of L-valine and4kg anhydrous ethanol added to50L glass reactor, stirring to dissolve, cooling to 0 ~ 10 ,Slowly added dropwise 8.8L of thionyl chloride, dropping was completed, the reaction was warmed to reflux 18h,Concentrated to dry, at 15 ~ 20 ° C was added 15L isopropyl acetate beating 1h,Filtering with suction gave 6.1 kg of an off-white solid, intermediate 1, where R1 is ethyl.
Reference:
[1] Tetrahedron, 2005, vol. 61, # 35, p. 8423 - 8442
[2] Journal of the Indian Chemical Society, 2001, vol. 78, # 3, p. 137 - 141
[3] Journal of the American Chemical Society, 2018, vol. 140, # 22, p. 6818 - 6822
[4] Chemistry of Natural Compounds, 1994, vol. 30, # 2, p. 238 - 244[5] Khimiya Prirodnykh Soedinenii, 1994, # 2, p. 261 - 268
[6] Tetrahedron, 1990, vol. 46, # 15, p. 5325 - 5332
[7] Helvetica Chimica Acta, 1995, vol. 78, p. 109 - 121
[8] Tetrahedron, 2007, vol. 63, # 14, p. 3031 - 3041
[9] European Journal of Medicinal Chemistry, 2011, vol. 46, # 1, p. 11 - 20
[10] Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2011, vol. 50, # 9, p. 1157 - 1164
[11] Green Chemistry, 2012, vol. 14, # 5, p. 1350 - 1356
[12] Tetrahedron, 2012, vol. 68, # 49, p. 10218 - 10229,12
[13] Tetrahedron, 2012, vol. 68, # 49, p. 10218 - 10229
[14] Nucleosides, Nucleotides and Nucleic Acids, 2013, vol. 32, # 4, p. 161 - 173
[15] Journal of Heterocyclic Chemistry, 2013, vol. 50, # 5, p. 1067 - 1070
[16] Patent: CN107056720, 2017, A, . Location in patent: Paragraph 0058; 0059; 0060; 0061
[17] Journal of Medicinal Chemistry, 2018, vol. 61, # 7, p. 2707 - 2724
[18] European Journal of Organic Chemistry, 2018, vol. 2018, # 44, p. 6088 - 6091
2
[ 72-18-4 ]
[ 17609-47-1 ]
Reference:
[1] Liebigs Annalen der Chemie, 1985, # 9, p. 1917 - 1921
3
[ 99474-03-0 ]
[ 17609-47-1 ]
Reference:
[1] Liebigs Annalen der Chemie, 1985, # 9, p. 1917 - 1921
4
[ 24601-74-9 ]
[ 17609-47-1 ]
Reference:
[1] Liebigs Annalen der Chemie, 1985, # 9, p. 1917 - 1921
5
[ 15136-26-2 ]
[ 17609-47-1 ]
Reference:
[1] Liebigs Annalen der Chemie, 1985, # 9, p. 1917 - 1921
6
[ 67436-18-4 ]
[ 17609-47-1 ]
Reference:
[1] Synthesis, 2011, # 20, p. 3247 - 3254
<i>N</i>-<<i>N</i>-benzyloxycarbonyl-glycyl>-L-tyrosyl azide[ No CAS ]
2-[(1-ethoxycarbonylmethyl-3-ethyl-2,4-dioxo-1,2,3,4-tetrahydro-2λ5-benzo[1,3,2]diazaphosphinine-2-carbonyl)-amino]-3-methyl-butyric acid ethyl ester[ No CAS ]
4,6,10,12,16,18,22,24-octahydroxy-5,11,17,23-tetra(1-ethoxycarbonyl(2-methyl))propylammoniomethyl-2,8,14,20-tetra(4-methyl)phenylpentacyclo[19.3.1.1(3,7).1(9,13).1(15,19)]octacoza-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecaene tetrahydrochloride[ No CAS ]
ethyl 2-(4,9-dioxo-4,9-dihydronaphtho[2,3-d][1,3]dithiol-2-imino)-3-methylbutanoate[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
79.3%
With triethylamine; In dichloromethane; at 0℃; for 4h;
General procedure: Typically, a mixture of 1,4-naphthoquinone (1a, 1.0 mmol, 0.158 g, 1.0 equiv), phenylalanine ethyl ester hydrochloride (2a, 1.2 mmol, 0.276 g, 1.2 equiv), CS2 (3a, 5 mmol, 0.381 g, 5.0 equiv), triethylamine (1.2 mmol, 0.121 g 1.2 equiv) in CH2Cl2 (5.0 mL) was stirred at 0 C under air condition for 4 h, determined by GC-MS and TLC. The solvent was removed under vacuum and the resulting crude product was purified by chromatography on silica gel eluted using CH2Cl2 as the eluent to afford the desired product 4a as red solid (0.3735 g, yield 88.2%, mp=149-150 C).
ethyl 2-(4,11-dioxo-4,11-dihydroanthra-[2,3-d][1,3]dithiol-2-imino)-3-methylbutanoate[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
41.1%
With triethylamine; In dichloromethane; at 0℃; for 4h;
General procedure: Typically, a mixture of 1,4-naphthoquinone (1a, 1.0 mmol, 0.158 g, 1.0 equiv), phenylalanine ethyl ester hydrochloride (2a, 1.2 mmol, 0.276 g, 1.2 equiv), CS2 (3a, 5 mmol, 0.381 g, 5.0 equiv), triethylamine (1.2 mmol, 0.121 g 1.2 equiv) in CH2Cl2 (5.0 mL) was stirred at 0 C under air condition for 4 h, determined by GC-MS and TLC. The solvent was removed under vacuum and the resulting crude product was purified by chromatography on silica gel eluted using CH2Cl2 as the eluent to afford the desired product 4a as red solid (0.3735 g, yield 88.2%, mp=149-150 C).
ethyl 2-(4,9-dioxo-4,9-dihydronaphtho[2,3-d][1,3]dithiol-2-imino)-3-methylbutanoate[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
70%
With triethylamine; In dichloromethane; at 0℃; for 2.5h;
General procedure: A mixture of 2,3-dichloro-1,4-naphthoquinone (1a, 1.0 mmol, 0.226 g, 1.0 equiv), phenylalanine ethyl ester hydrochloride (2a, 1.2 mmol, 0.276 g, 1.2 equiv), CS2 (3a, 5 mmol, 0.381 g, 5.0 equiv),triethylamine (3.2 mmol, 0.324g, 3.2 equiv) in CH2Cl2 (5.0 mL), was stirred at 0C under aircondition for 2.5 hours, determined by GC-MS and TLC. The solvent was removed under vacuum and the resulting crude product was purified by chromatography on silica gel eluted using CH2Cl2 as the eluent to afford the desired product 4a as red solid (0.348 g, yield 82.3%, mp=149-150C).
ethyl (1,1″-dibenzyl-5,5″-dichloro-4′-hydroxy-2′-(4-methylbenzoyl)-2,2″-dioxo-4′-(p-tolyl)dispiro[indoline-3,1′-cyclopentane-3′,3″-indolin]-5′-yl)valinate[ No CAS ]
ethyl (1,1″-dibenzyl-5,5″-dichloro-4′-hydroxy-2′-(4-methylbenzoyl)-2,2″-dioxo-4′-(p-tolyl)dispiro[indoline-3,1′-cyclopentane-3′,3″-indolin]-5′-yl)valinate[ No CAS ]