Ral HPLC (Chiralcel OD, Hex/iPrOH 99:1, 1 mL/min, 25 ), tr 16.05 min (significant

Ral HPLC (Chiralcel OD, Hex/iPrOH 99:1, 1 mL/min, 25 ), tr 16.05 min (significant MMP-1 Inhibitor Source diastereomer), tr 23.68 min (minor diastereomer).NIH-PA Author Manuscript NIH-PA Author ManuscriptJ Org Chem. Author manuscript; out there in PMC 2014 December 06.Khumsubdee et al.Page(2R,3R)-4-((Topo II Inhibitor review tert-Butyldiphenylsilyl)oxy)-2-fluoro-3-methylbutan-1-ol (anti-8) The compound was prepared based on the common -fluorination process catalysed by (R)-5-benzyl-2,two,3,-trimethylimidazolidin-4-one dichloroacetic acid salt. Purification by flash chromatography afforded anti-8 as a colorless oil (153 mg, 85 isolated yield). 1H NMR (400 MHz, CDCl3) 7.74 7.69 (m, 4H), 7.51 7.41 (m, 6H), 4.72 (dtd, J = 48.8, six.four, 3.1 Hz, 1H), 3.97 three.75 (m, 2H), 3.67 3.64 (m, 2H), two.28 (br, 1H), 2.11 2.00 (m, 1H), 1.12 (s, 9H), 0.99 (dd, J = 7.0, 0.eight Hz, 3H); 13C NMR (one hundred MHz, CDCl3) 135.six (d, J = 4.five Hz), 133.three (d, J = eight.2 Hz), 129.eight (s), 127.eight (d, J = 1.six Hz), 95.four (d, J = 171.0 Hz), 65.two (d, J = six.0 Hz), 63.7 (d, J = 22.6 Hz), 37.four (d, J = 19.6 Hz), 26.9 (s), 11.7 (d, J = 5.8 Hz); 19F NMR (282 MHz, CDCl3) -198.46 -198.93 (m). IR (CH2Cl2) n (cm-1) 3356, 3071, 2932, 2859, 2361, 1470, 1427, 1389, 1362, 1111, 1034. HRMS (ESI, TOF): m/z = 361.2035, calcd For C21H30FO2Si [M+H]+ 361.1999. The diastereoselectivity was 1.0:58, determined by 19F NMR and confirmed by Chiral HPLC (Chiralcel OD, Hex/iPrOH 99:1, 1 mL/min, 25 ), tr 16.05 min (minor diastereomer), tr 23.68 min (important diastereomer). Relative stereochemistry determination of 8: since each catalyst and reaction condition are identical to what has been reported, and also the reaction is catalyst controlled; the stereochemistry was assigned according to MacMillan’s fluorinated product. The solution can’t be easily converted to any recognized structure.NIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptTypical Process for the -Amination of your AldehydeA modification of reported procedure38 was utilised. Dibenzyl azodicarboxylate (90 , 1.29 g, three.9 mmol) and proline (70 mg, 0.six mmol) in MeCN (ten mL) were cooled down to -3 . The aldehyde (1.02 g 3.0 mmol) was then added plus the mixture was stirred at -3 for two h. The reaction was gradually warmed to 20 within ca. 1 h. The mixture was then cooled to 0 , treated with MeOH (three mL) and NaBH4 (240 mg, 6.0 mmol) and was stirred for 5 min at 0 . The reaction was quenched by 1M KHSO4. The aqueous resolution was extracted with EtOAc 3 instances. The combined organic layers have been dried with MgSO4, and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel, eluting with 15 EtOAc/hexanes gave the preferred alcohol as white foamy strong.J Org Chem. Author manuscript; readily available in PMC 2014 December 06.Khumsubdee et al.PageNIH-PA Author ManuscriptDibenzyl 1-((2R,3S)-4-((tert-Butyldiphenylsilyl)oxy)-1-hydroxy-3-methylbutan-2yl)hydrazine-1,2-dicarboxylate (anti-9) The compound was ready as outlined by the common -amination process catalysed by (R)-Proline. Purification by flash chromatography afforded anti-9 as a white foamy solid (1.54 g, 80 isolated yield). 1H NMR (400 MHz, CDCl3) 7.70 7.67 (m, 4H), 7.50 7.27 (m, 16H), 6.85 (d, J = 31.1 Hz, 1H), five.37 five.10 (m, 4H), 4.45 4.12 (m, 2H), 3.80 3.41 (m, 4H), 1.95 1.66 (m, 1H), 1.12 1.09 (m, 9H), 0.99 0.88 (m, 3H); 13C NMR (100 MHz, CDCl3) 159.1, 157.4, 135.six, 133.3, 133.two, 129.six, 129.eight, 128.7, 128.6, 128.2, 127.9, 127.8, 127.7, 68.62, 65.88, 65.56, 60.37, 35.6, 26.9, 19.three, 15.1. IR (CH2Cl2) n (cm-1) 335.