Synlett 2023; 34(01): 40-44
DOI: 10.1055/a-1948-7153
letter

Synthesis of Lincosamide Analogues via Oxime Resin Aminolysis

Thomas Tremblay
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Pénélope Haguette
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Gabrielle Robert-Scott
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Jessica B. Alcée
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Christopher Bérubé
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Catherine Bergeron
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
Normand Voyer
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
,
a   Département de Chimie, 1045 Avenue de la Médecine, Université Laval, Québec City, Québec, G1V 0A6, Canada
› Author Affiliations
This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the PROTEO Catalyst Grant Program. T.T. and C. B. thanks the NSERC for a postgraduate fellowship, P. H., G. R.-S., and J. A. thanks the NSERC for an Undergraduate Student Research Award.


Abstract

In this work, the synthetic development of an oxime resin aminolysis to lincosamide analogues is described. This synthetic endeavor hinges on a protecting-group-free strategy of the amino sugar nucleophiles. The cleavage from the solid support is achieved under mild conditions in a buffer solution and allows the preparation of a wide diversity of amino acid moieties onto glycosylamine scaffolds. The strategy is further exploited using methylthiolincosamine to generate rapidly complex lincomycin analogues. The results pave the way to access efficiently novel potentially relevant antibacterial compounds.

Supporting Information



Publication History

Received: 10 August 2022

Accepted after revision: 21 September 2022

Accepted Manuscript online:
21 September 2022

Article published online:
03 November 2022

© 2022. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 
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  • 23 Typical Experimental Procedure for the Cleavage of Oxime Resin To a peptide synthesis vessel was added the oxime resin (1.1 mmol g–1, 1.25 equiv) and was swelled with CH2Cl2 (3 × 5 mL). To a solution of the oxime resin in CH2Cl2/DMF (8:2, 0.02 M) were added amino sugar (1 equiv) and DIPEA (2.5 equiv). The vessel was mechanically stirred for a few seconds, and acetic acid (5 equiv) was added to the mixture. The peptide synthesis vessel was mechanically stirred at room temperature until starting material was consumed (overnight). The content of the vessel was then collected in a flask and the resin was washed with CH2Cl2 (3 × 5 mL) and MeOH (3 × 5 mL). The organic phase was concentrated under reduced pressure, and the resulting crude was purified by flash column chromatography. Characterization Data for S-Methyl 6-Deoxy-6-{[N-(N-acetyl)-glycinyl]}-l-leucylamido-α-thiolincosaminide (10) Rf = 0.49 (silica, MeOH/DCM, 1:4); [α]D 25 96.2 (c 0.3, MeOH). IR (ATR, diamond): ν = 3307, 1659, 1642, 1285, 1075, 1049 cm–1. 1H NMR (500 MHz, D2O): δ = 5.35 (d, 3 J H1–H2 = 5.8 Hz, 1 H, H1), 4.34 (dd, 3 J CHαLeu–CH2αβLeu = 9.8 Hz, 3 J CHαLeu-CH2αβLeu = 5.0 Hz, 1 H, CHαLeu), 4.29 (dd, 3 J H6–H5 = 9.7 Hz, 3 J H6–H7 = 4.5 Hz, 1 H, H6), 4.23 (dd, 3 J H5–H6 = 9.7 Hz, 3 J H5–H4 = 1.2 Hz, 1 H, H5), 4.111 (qd, 3 J H7–H8a = 3 J H7–H8b = 3 J H7–H8c = 6.5 Hz, 3 J H7–H6 = 4.5 Hz, 1 H, H7), 4.095 (dd, 3 J H2–H3 = 10.2 Hz, 3 J H2–H1 = 5.7 Hz, 1 H, H2), 3.93 (dd, 3 J H4–H3 = 3.2 Hz, 3 J H4–H5 = 1.2 Hz, 1 H, H4), 3.89 (d, 2 J CH2aGly–CH2bGly = 17.0 Hz, 1 H, CH2bGly), 3.64 (dd, 3 J H3–H2 = 10.4 Hz, 3 J H3–H4 = 3.2 Hz, 1 H, H3), 2.13 (s, 3 H, SCH3), 2.05 (s, 3 H, COCH3), 1.71–1.57 (m, 3 H, CH2βLeu, CHγLeu), 1.13 (d, 3 J CH3(8)–H7 = 6.5 Hz, 3 H, CH3(8)), 0.94 (d, 3 J CH3δ1Leu–CHγLeu = 6.1 Hz, 1 H, CH3δ1Leu), 0.88 (d, 3 J CH3δ2Leu–CHγLeu = 6.1 Hz, 1 H, CH3δ2Leu) ppm. 13C NMR (126 MHz, D2O): δ = 174.9, 174.8, 171.7 (3 C, 3 × CO), 88.0 (1 C, C1), 70.2 (1 C, C3), 69.4 (1 C, C5), 68.3 (1 C, C4), 67.6 (1 C, C2), 66.7 (1 C, C7), 53.1 (1 C, C6), 52.7 (1 C, CHαLeu), 42.4 (1 C, CH2Gly), 39.6 (1 C, CH2βLeu), 24.2 (1 C, CH2γLeu), 22.0 (1 C, CH3δ1Leu), 21.6 (1 C, COCH3), 20.5 (1 C, CH3δbLeu), 15.9 (1 C, C8), 12.8 (1 C, SCH3) ppm. HRMS (ESI) m/z [M + H]+ calcd for C19H36N3O8S+: 466.2218; found: 466.2209. Characterization Data for S-Methyl 6-Deoxy-6-{[N-(N-tert-butoxycarbonyl)-l-phenylalanyl]-l-alanylamido}-α-thiolincosaminide (11) Rf = 0.32 (silica, MeOH/DCM, 1:9); [α]D 25 120.4 (c 0.4, MeOH). IR (ATR, diamond): ν = 3333, 2926, 1691, 1631, 1530, 1168, 1050 cm–1. 1H NMR (500 MHz, CD3OD): δ = 7.31–7.19 (m, 5 H, Ar–Phe), 5.26 (d, 3 J H1–H2 = 5.6 Hz, 1 H, H1), 4.33 (q, 3 J CHαPhe–CH3aAla = 3 J CHαPhe–CH3bAla = 3 J CHαPhe–CH3cAla = 7.3 Hz, 1 H, CHαAla), 4.32 (dd, 3 J CHαPhe–CH2bPhe = 9.9 Hz, 3 J CHαPhe–CH2aPhe = 4.7 Hz, 1 H, CHαPhe), 4.25–4.18 (m, 2 H, H5, H6), 4.09 (dd, 3 J H2–H3 = 10.1 Hz, 3 J H2–H1 = 5.6 Hz, 1 H, H2), 4.00 (p, 3 J H7–H8a = 3 J H7–H8b = 3 J H7–H8b = 3 J H7–H6 = 6.2 Hz, 1 H, H7), 3.95 (d, 3 J H4–H3 = 3.4 Hz, 1 H, H4), 3.56 (dd, 3 J H3–H2 = 10.2 Hz, 3 J H3–H4 = 3.4 Hz, 1 H, H3), 3.16 (dd, 2 J CH2aPhe–CH2bPhe = 13.9 Hz, 3 J CH2aPhe–CHαPhe = 4.7 Hz, 1 H, CH2aPhe), 2.80 (dd, 2 J CH2bPhe–CH2aPhe = 14.1 Hz, 3 J CH2bPhe–CHαPhe = 9.9 Hz, 1 H, CH2bPhe), 2.10 (s, 3 H, SCH3), 1.39 (d, 3 J CH3Ala–CHαAla = 7.3 Hz, 3 H, CH3Ala), 1.35 (s, 9 H, C(CH3)3), 1.19 (d, 3 J C H3 (8)–H7 = 6.4 Hz, 3 H, CH3(8)) ppm. 13C NMR (126 MHz, CD3OD): δ = 175.7, 174.5, 157.8 (3 C, 3 × CO), 138.7, 130.4, 129.4, 127.7 (6 C, Ar–Phe), 89.9 (1 C, C1), 80.7 (1 C, C(CH3)3), 71.9 (1 C, C3), 70.8 (1 C, C5), 70.4 (1 C, C4), 69.5 (1 C, C2), 68.1 (1 C, C7), 57.2 (1 C, CHαPhe), 55.8 (1 C, C6), 50.9 (1 C, CHαAla), 39.1 (1 C, CH2Phe), 28.7 (3 C, C(CH3)3), 18.5 (1 C, C8), 17.9 (1 C, CH3Ala), 13.6 (1 C, SCH3) ppm. HRMS (ESI): m/z [M + H]+ calcd for C26H42N3O9S+: 572.2636; found: 572.2640.