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Volumn , Issue 3, 2008, Pages 329-332

An approach to cannabinoids by radical cyclisation of 1,7-dienes using diethyl thiophosphite

Author keywords

Addition reactions; Cyclisations; Ethers; Radical reactions; Substituent effects

Indexed keywords

ALKADIENE; CANNABINOID; CHROMAN DERIVATIVE; PHOSPHOROTHIOIC ACID; SALICYLALDEHYDE;

EID: 39749186596     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2008-1032049     Document Type: Article
Times cited : (10)

References (44)
  • 25
    • 29244460056 scopus 로고    scopus 로고
    • For complementary 6-exo-trig radical cyclisation approaches to tetrahydropyrans, see: (a) Lee, E. Pure Appl. Chem. 2005, 77, 2073.
    • For complementary 6-exo-trig radical cyclisation approaches to tetrahydropyrans, see: (a) Lee, E. Pure Appl. Chem. 2005, 77, 2073.
  • 31
    • 39749175982 scopus 로고    scopus 로고
    • All new compounds gave consistent spectral and high resolution mass spectroscopic data
    • All new compounds gave consistent spectral and high resolution mass spectroscopic data.
  • 34
    • 39749108517 scopus 로고    scopus 로고
    • Z)-1-(2-Methylpent-3-en-2-yloxy)-2-vinylbenzene (13a, yellow oil. IR (CDCl3, 3085, 3065, 2958, 2927, 1603, 1487, 1456, 1439, 1377, 1174, 1120 cm-1. 1H NMR (400 MHz, CDCl3, δ, 6.80-7.70 (m, 4 H, 4 x ArCH, 7.10 (dd, J, 17.5, 11.0 Hz, 1 H, CH=CHAHB, 5.72 (dd, J, 17.5 1.5 Hz, 1 H, CH=CHAHB, 5.64 (dq, J, 12.0, 1.5 Hz, 1 H, CH=CHMe, 5.54 (dq, J, 12.0, 7.0 Hz, 1 H, CH=CHMe, 5.22 (dd, J, 11.0, 1.5 Hz, 1 H, CH=CH AHB, 1.70 (d, J, 7.0 Hz, 3 H, Me, 1.53 (s, 6 H, MeCMe, 13C NMR (100 MHz, CDCl3, δ, 153.5 (ArCO, 135.1, 132.0, 128.4, 127.4, 126.1, 120.7, 118.1 (4 x ArCH, CH=CHAHB, CH=CHMe, 128.6 (ArCCH=C, 113.7 (CH=CHAHB, 79.4 MeCMe, 28
    • +]: 203.1436; found: 203.1436.
  • 35
    • 39749189818 scopus 로고    scopus 로고
    • Synthesis of O,O-Diethyl (3-Ethyl-2,2-dimethyl-3,4- dihydro-2H-chromen-4-yl)methylphosphonothioate (14a, 1,7-Diene 13a (0.150 g, 0.74 mmol, 1 equiv, diethyl thiophosphite (0.114 g, 0.74 mmol, 1 equiv) and AIBN (0.097 g, 0.59 mmol, 0.8 equiv, 1 portion) were heated to reflux in degassed cyclohexane (20 mL) overnight. After cooling to r.t, the solvent was evaporated and purification of the crude product by column chromatography (silica, petrol) afforded 14a (0.073 g, 28, as a colourless oil, as an inseparable 1:1 mixture of cis- and trans-diastereoisomers as indicated by the 1H NMR spectrum. IR (CH2Cl2, 3055, 2983, 2937, 2904, 2879, 1606, 1581, 1487, 1452, 1387, 1371, 1302, 1261, 1225, 1159, 1026 cm-1. 1H NMR (400 MHz, CDCl3; both diastereoisomers, δ, 7.40, 7.29 (2 x d, 2 x J, 8.0 Hz, 1 H, ArCH, 7.11, 7.09 2 x t, 2 x J, 8.0 Hz
    • +]: 357.1653; found: 357.1652.
  • 36
    • 0034678011 scopus 로고    scopus 로고
    • For other examples of 6-exo cyclisations of benzylic radicals, see: (a) Studer, A. Angew Chem. Int. Ed. 2000, 1108.
    • For other examples of 6-exo cyclisations of benzylic radicals, see: (a) Studer, A. Angew Chem. Int. Ed. 2000, 1108.
  • 39
    • 0343043242 scopus 로고    scopus 로고
    • Resonance-stabilised radicals are known to undergo reversible cyclisations. See for example: (a) Walling, C.; Cioffari, A. J. Am. Chem. Soc. 1972, 94, 6064.
    • Resonance-stabilised radicals are known to undergo reversible cyclisations. See for example: (a) Walling, C.; Cioffari, A. J. Am. Chem. Soc. 1972, 94, 6064.
  • 42
    • 39749150153 scopus 로고    scopus 로고
    • Synthesis of Methyl 2-{4, Diethoxyphosphorothioyl)methyl]-2,2- dimethyl-3,4-dihydro-2H-chromen-3-yl}acetate (14c, 1,7-Diene 13c (0.250 g, 1.02 mmol, 1 equiv, diethyl thiophosphite (0.782 g, 5.08 mmol, 5 equiv) and AIBN (0.042 g, 0.25 mmol, 0.25 equiv, 5 portions, 1 h between additions) were heated to reflux in anhyd degassed THF (20 mL) overnight. After cooling to r.t, the solvent was evaporated and excess diethyl thiophosphite was removed by distillation (75°C/3 mmHg, Purification of the residue by column chromatography (silica; PE-Et2O, 9:1) afforded 14c (0.221 g, 54, as a yellow oil. IR (CH2Cl2, 2982, 2953, 2853, 1735, 1608, 1582, 1488, 1453, 1437, 1388, 1372, 1302, 1249, 1228, 1170, 1138, 1116, 1098, 1026 cm-1. 1H NMR (400 MHz, CDCl3, δ, 7.48 (d, J, 7.5 Hz, 1 H, ArCH, 7.11 (t, J, 7.5 Hz, 1 H, ArCH, 6.90 t, J, 7.5 Hz, 1 H, ArCH, 6.76
    • +]: 401.1552; found: 401.1551.
  • 43
    • 39749083081 scopus 로고    scopus 로고
    • 4-(2,2-Diphenylvinyl)-3-ethyl-2,2-dimethylchromane (15, colourless oil (6.5:1 mixture of diastereoisomers, IR (CH2Cl 2, 3019, 2958, 2931, 1598, 1581, 1484, 1451, 1386, 1302, 1148, 1030 cm-1. 1H NMR (400 MHz, CDCl3; both diastereoisomers, δ, 7.20-7.42 (m, 11 H, 11 x ArCH, 7.11 (t, J, 7.0 Hz, 1 H, ArCH, 6.85 (t, J, 7.0 Hz, 1 H, ArCH, 6.77 (d, J, 7.0 Hz, 1 H, ArCH, 6.29, 5.95 (2 x d, J, 2 x 10.5 Hz, 1 H, cis-C=CH and trans-C=CH, 3.42 (app. t, J, 10.5 Hz, 1 H, CHCH=C, 1.54 (dt, J, 10.5, 4.5 Hz, 1 H, CHCH 2Me, 0.98, 1.42 (2 x s, 2 x 3 H, MeCMe, 1.20-1.40 (m, 2 H, CH2Me, 0.80-0.92 (m, 3 H, CH2Me, 13C NMR (100 MHz, CDCl3; both diastereoisomers, δ, 153.1 (ArCO, 143.2, 142.3, 139.8 3 x ArC, 131.1, 2 x 129.6, 2 x 128.4, 2 x 128.2, 127.8, 2 x 127.3
    • +]: 369.2218; found: 369.2217.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.