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DOI: 10.1055/s-2008-1077981
Chemoenzymatic Synthesis of Enantiopure Structured Triacylglycerols
Publikationsverlauf
Publikationsdatum:
31. Juli 2008 (online)
Abstract
A highly efficient chemoenzymatic method for the synthesis of enantiopure ABC-type asymmetrically structured triacylglycerols has been developed starting from enantiopure (S)-solketal and involving two lipase steps.
Key words
asymmetrically structured triacylglycerols - regioselectivity - lipase - eicosapentaenoic acid - acyl migration
-
1a
Miura S.Ogawa A.Konishi H. J. Am. Oil Chem. Soc. 1999, 76: 927 -
1b
Fomuso LB.Akoh CC. J. Am. Oil Chem. Soc. 1998, 75: 405 -
1c
Christensen MS.Höy C.-E.Becker CC.Redgrave TG. Am. J. Clin. Nutr. 1995, 61: 56 - 2
Halldorsson A.Magnusson CD.Haraldsson GG. Tetrahedron 2003, 59: 9101 -
3a
Haraldsson GG.Hjaltason B. In Structured and Modified LipidsGunstone FD. Marcel Decker; New York: 2001. p.313-350 -
3b
Hjaltason B.Haraldsson GG. In Modifying Lipids for Use in FoodGunstone FD. Woodhead Publishing; Cambridge UK: 2006. Chap. 4. p.56-79 - For reviews, see:
-
4a
Stansby ME. In Fish Oils in NutritionStansby ME. van Nostrand Reinhold; New York: 1990. Chap. 10. p.268-288 -
4b
Nettleton JA. Omega-3 Fatty Acids and Health Chapman and Hall; New York: 1995. -
4c
Lands WEM. Fish, Omega-3 and Human Health 2nd ed.: AOCS Press; Champaign IL: 2005. - 5
Haraldsson GG. In Handbook of Industrial BiocatalysisHou CT. CRC Press, Taylor and Francis Group; Boca Raton: 2005. Chap. 18. p.18-1-18-21 -
6a
Berger M.Laumen K.Schneider MP. J. Am. Oil Chem. Soc. 1992, 69: 955 -
6b
Aha B.Berger M.Jakob B.Machmüller G.Waldinger C.Schneider MP. In Enzymes in Lipid ModificationBornscheuer UT. Wiley-VCH; Weinheim: 2000. p.100-115 -
6c
Irimescu R.Furihata K.Hata K.Iwasaki Y.Yamane T. J. Am. Oil Chem. Soc. 2001, 78: 285 -
6d
Irimescu R.Iwasaki Y.Hou CT. J. Am. Oil Chem. Soc. 2002, 79: 879 -
6e
Kawashima A.Shimada Y.Yamamoto M.Sugihara A.Nagao T.Komemushi S.Tominaga Y. J. Am. Oil Chem. Soc. 2001, 78: 611 - 8
Kato Y.Fujiwara I.Asano Y. J. Mol. Catal. B: Enzym. 2000, 9: 193 -
9a
Wang Y.-F.Wong C.-H. J. Org. Chem. 1988, 53: 3127 -
9b
Guanti G.Banfi L.Basso A.Bevilacqua E.Bondanza L.Riva R. Tetrahedron: Asymmetry 2004, 15: 2889 -
9c
Halldorsson A.Thordarson P.Kristinsson B.Magnusson CD.Haraldsson GG. Tetrahedron: Asymmetry 2004, 15: 2893 -
9d
Ransac S.Rogalska E.Gargouri Y.Deveer AMTJ.Paltauf F.de Haas GH.Verger R. J. Biol. Chem. 1990, 265: 20263 -
9e
Theil F.Lemke K.Ballschuh S.Kunath A.Schick H. Tetrahedron: Asymmetry 1995, 6: 1323 -
10a
Rogalska E.Ransac S.Verger R. J. Biol. Chem. 1990, 265: 20271 -
10b
Villeneuve P.Pina M.Montet D.Graille J. Chem. Phys. Lipids 1995, 76: 109 -
10c
Villeneuve P.Pina M.Graille J. Chem. Phys. Lipids 1996, 83: 161 -
10d
Lang DA.Dijkstra BW. Chem. Phys. Lipids 1998, 93: 115 -
10e
Rogalska E.Cudrey C.Ferrato F.Verger R. Chirality 1993, 5: 24 -
10f
Lang DA.Mannesse MLM.de Haas GH.Verheij HM.Dijkstra BW. Eur. J. Biochem. 1993, 254: 333 -
10g
Uzawa H.Nishida Y.Ohrui H.Meguro H. Biochem. Biophys. Res. Commun. 1990, 168: 506 -
10h
Uzawa H.Noguchi T.Nishida Y.Ohrui H.Meguro H. Biochim. Biophys. Acta 1993, 1168: 253 -
11a
Chandler IC.Quinlan PT.McNeill GP. J. Am. Oil Chem. Soc. 1998, 75: 1513 -
11b
Iwasaki Y.Yamane T. J. Mol. Catal. B: Enzym. 2000, 10: 129 - 12
Piyatheerawong W.Yamane T.Nakano H.Iwasaki Y. J. Am. Oil Chem. Soc. 2006, 83: 603 - 13
Compton DL.Vermillion KE.Laszlo JA. J. Am. Oil Chem. Soc. 2007, 84: 343 -
15a
Kodali DR.Tercyak A.Fahey DA.Small DM. Chem. Phys. Lipids 1990, 52: 163 -
15b
Bloomer S.Adlercreutz P.Mattiasson B. Biocatalysis 1991, 5: 145 -
15c
Fureby AM.Virto C.Adlercreutz P.Mattiasson B. Biocat. Biotrans. 1996, 14: 89 - 16
Laszlo JA.Compton DL.Vermillion KE. J. Am. Oil Chem. Soc. 2008, 85: 307 - 19
Vilcheze C.Bittman R. J. Lipid Res. 1994, 35: 734 - 21
Reese CB.Yan H. J. Chem. Soc., Perkin Trans. 1 2001, 1807
References and Notes
Novozym 435, CAL-B; a gift from Novozyme A/S (Bagsvaerd, Denmark).
14Sigma-Aldrich (Steinheim, Germany): (S)-(+)-1,2-O-isopropylidene-sn-glycerol of 98% purity and 99% ee.
17[α]D ²0 +5.5 (c 20, CHCl3), identical to that in ref. 18.
18Aldrich Chemical Catalog, (R)-(+)-benzyloxy-1,2-propanediol, 99%: [α]D ²0 +5.5 (c 20, CHCl3).
20
Procedure for
the Preparation of 1-
O
-Octadecanoyl-
sn
-glycerol [(
S
)-4]
To a solution of
3-O-benzyl-sn-glycerol [(R)-3, 1.497
g, 6.73 mmol] and vinyl stearate (3.827 mg, 12.3 mmol)
in CH2Cl2 (8.2 mL) was added immobilized CAL
(99 mg). The resulting suspension was stirred at r.t. for approx.
70 min when TLC monitoring (EtOAc-PE, 1:1) indicated a complete
reaction. The lipase preparation was separated by filtration and
the solvent removed in vacuo on a rotary evaporator. The resulting
residue was dissolved in THF (30 mL) without further purification
followed by addition of n-hexane (70
mL) and Pd/C catalyst (370 mg). The reaction was performed
in a PARR reactor under hydrogen pressure (5 bar) during which the
product precipitated. When the reaction had proceeded to completion
(about 2 h), THF was added until all the product had been dissolved.
The catalyst was separated off by filtration by the aid of Celite
and the solvent removed in vacuo on a rotary evaporator. The residue
was redissolved in minimum amount of THF and a fourfold volume of n-hexane added. The resulting mixture was
allowed to stand at r.t. overnight to afford the product as white
crystals (2.057 g, 5.73 mmol) in 85% overall yield; mp 59.5-60.7 ˚C. [α]D
²0 +2.43
(c 6, THF). ¹H NMR
(400 MHz, CDCl3): δ = 4.21 (dd, J = 11.6,
4.8 Hz, 1 H, OCOCH2), 4.15 (dd, J = 11.6,
6.0 Hz, 1 H, OCOCH2), 3.96-3.90 (m, 1 H, CH2CHCH2), 3.72-3.67
(m, 1 H, CH
2OH), 3.63-3.57
(m, 1 H, CH
2OH), 2.52 (d, J = 5.2 Hz,
1 H, CHOH), 2.35 (t, J = 7.6
Hz, 2 H, CH2COO), 2.08 (t, J = 6.0
Hz, 1 H, CH2OH), 1.65-1.59
(m, 2 H, CH
2CH2COO),
1.36-1.18 (m, 28 H, CH2), 0.88 (t, J = 6.5 Hz,
3 H, CH2CH
3). ¹³C
NMR (100 MHz, CDCl3): δ = 174.3, 70.3,
65.2, 63.3, 34.1, 31.9, 29.7 (5 C), 29.6 (2 C), 29.4 (2 C), 29.3,
29.2, 29.1, 24.9, 22.7, 14.1. FT-IR: 3150-3600 (br, OH),
2918 (vs, CH), 2849 (vs, CH), 1735 (vs, C=O) cm-¹.
HRMS (APCI): m/z calcd for C21H42O4 - OH:
341.3050; found: 341.3042 amu.
Procedure for
3-
O
-Decanoyl-1-octadecanoyl-
sn
-glycerol [(
S
)-5]
Immobilized Candida antarctica lipase (45 mg) was
added to a 10 mL round-bottom flask containing a mixture of 1-octadecanoyl-sn-glycerol [(S)-4, 203 mg, 0.566 mmol] and vinyl
decanoate (168 mg, 0.849 mmol) dissolved in THF (2 mL). The resulting
suspension was stirred at r.t. for 2-3 h or until TLC monitoring
(EtOAc-PE, 1:1) indicated a complete reaction. The lipase
preparation was removed by filtration and the solvent removed in
vacuo on a rotary evaporator to afford pure 3-O-decanoyl-1-octadecanoyl-sn-glycerol [(S)-5, 246 mg, 0.480 mmol] as a white
crystalline material in 85% yield after recrystallization
from MeOH; mp 53.4-54.0 ˚C; [α]D
²0 +0.02
(c 10, CH2Cl2). ¹H
NMR (400 MHz, CDCl3): δ = 4.20-4.06
(m, 5 H, CH2CHCH2), 2.47 (d, J = 3.6
Hz, 1 H, OH), 2.34 (t, J = 7.6
Hz, 4 H, CH2COO), 1.68-1.59 (m, 4 H, CH
2CH2COO), 1.36-1.18
(m, 40 H, CH2), 0.87 (t, J = 6.8
Hz, 6 H, CH3). ¹³C NMR (100
MHz, CDCl3): δ = 173.9 (2 C), 68.4,
65.1 (2 C), 34.1 (2 C), 32.0, 31.9, 29.7 (5 C), 29.6 (2 C), 29.5
(2 C), 29.4 (3 C), 29.3 (2 C), 29.1 (2 C), 24.9 (2 C), 22.7 (2 C),
14.1 (2 C). FT-IR: 3300-3600 (br, OH), 2914 (vs, CH), 2849
(vs, CH), 1732 (vs, C=O), 1708 (vs, C=O) cm-¹.
HRMS (APCI): m/z calcd for C31H60O5 - OH
495.4408; found: 495.4412 amu.
Procedure for
3-
O
-Decanoyl-2-eicosapentaenoyl-1-octadecanoyl-
sn
-glycerol [(
S
)-2]
To
a solution of 3-O-decanoyl-1-octadecanoyl-sn-glycerol [(S)-5, 100 mg, 0.195 mmol] and EPA
as free acid (66.0 mg, 0.218 mmol) in CH2Cl2 (2
mL) were added DMAP (20 mg, 0.16 mmol) and EDAC (50 mg, 0.26 mmol).
The resulting solution was stirred on a magnetic stirrer hotplate
at r.t. for 12 h. The reaction was disconnected by passing the reaction mixture
through a short column packed with silica gel by use of Et2O-CH2Cl2 (10:90).
Solvent removal in vacuo afforded the pure product as a yellowish
oil (141 mg, 0.177 mmol, 91% yield). [α]D
²0 +0.16
(c 10, CH2Cl2). ¹H
NMR (400 MHz, CDCl3): δ = 5.42-5.33
(m, 10 H, =CH), 5.32-5.23 (m, 1 H, CH2CHCH2), 4.29 (dd, J = 12.0,
4.4 Hz, 2 H, CH
2CHCH
2), 4.14 (dd, J = 12.0,
6.0 Hz, 2 H, CH
2CHCH
2), 2.86-2.78 (m,
8 H, =CCH2C=), 2.34 (t, J = 7.6 Hz,
2 H, CH2COO in EPA), 2.31 (t, J = 7.6
Hz, 4 H, CH2COO), 2.14-2.04 (m, 4 H, =CCH
2CH2 and =CCH
2CH3), 1.70 (quint, J = 7.6 Hz,
2 H, CH
2CH2COO
in EPA), 1.64-1.55 (m, 4 H, CH
2CH2COO),
1.34-1.20 (m, 40 H, CH2), 0.97 (t, J = 7.6 Hz,
3 H, CH3 in EPA), 0.88 (t, J = 6.8
Hz, 6 H, CH3 in C18). ¹³C
NMR (100 MHz, CDCl3): δ = 173.3 (2
C), 172.6, 132.0, 128.9, 128.8, 128.6, 128.3, 128.2, 128.1, 128.0,
127.8, 127.0, 69.0, 62.1 (2 C), 34.0 (2 C), 33.6, 31.9, 31.8, 29.7
(5 C), 29.6 (2 C), 29.5, 29.4 (2 C), 29.3 (2 C), 29.2 (3 C), 29.1, 26.5,
25.6 (3 C), 25.5, 24.8 (2 C), 24.7, 22.7, 22.6, 20.5, 14.3, 14.1
(2 C). FT-IR: 3013 (s, CH), 2925 (vs, CH), 2854 (vs, CH), 1745 (vs,
C=O) cm-¹. HRMS (APCI): m/z calcd for C51H88O6 + NH4:
814.6919; found: 814.6913 amu.