Synthesis 2003(9): 1403-1412
DOI: 10.1055/s-2003-40187
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart ˙ New York

Study of Substrate Dependence on the Diastereoselectivity of the Ruthe­nium(II) Porphyrin Catalyzed Tandem Formation and 1,3-Dipolar Cyclo­addition Reactions of Carbonyl Ylides

Cong-Ying Zhou, Philip Wai Hong Chan, Wing-Yiu Yu, Chi-Ming Che*
Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
Fax: +85228571586.; e-Mail: cmche@hku.hk;
Further Information

Publication History

Received 16 April 2003
Publication Date:
24 June 2003 (online)

Abstract

The effect of substrate substitution on reaction selectivity for the ruthenium(II) porphyrin catalyzed tandem carbonyl ylide formation/1,3-dipolar cycloaddition reaction of a variety of alkyl and aryl substituted α-diazo ketones 1 with π-unsaturated compounds was examined. The results suggested the diastereoselectivity of the reaction to be highly substrate dependant. Similar yields and cis/trans selectivities have also been achieved for the analogous reactions with rhodium(II,II) dimer as catalyst.

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4-[(2,4-Dinitro-phenyl)-hydrazono]-2-ethyl-1-phenyl-8-oxa-bicyclo[3.2.1]oct-6-ene-6,7-Dicarboxylic Acid Dimethyl Ester (3) (Scheme [3] ) Yellow crystals; mp 230-232 °C.
IR (KBr): 3326, 3082, 2963, 1757, 1718, 1624, 1583, 1495, 1435, 1335, 1259, 1200, 1140, 1005 cm-1,
1H NMR (400 MHz, CDCl3): δ = 11.2 (s, 1 H), 9.14 (d, 1 H, J = 2.5 Hz), 8.36 (dd, 1 H, J = 9.6, 2.5 Hz), 8.06 (d, 1H, J = 9.6 Hz), 7.32-7.42 (m, 5 H), 5.57 (s, 1 H), 3.77 (s, 3 H), 3.70 (s, 3 H), 2.90 (d, 1 H, J = 16.4 Hz), 2.84 (dd, 1 H, J = 16.4, 6.5 Hz), 2.64 (m, 1 H), 1.32-1.38 (m, 1 H), 1.20-1.28 (m, 1 H), 0.93 (t, 3 H, J = 7.4 Hz).
13C NMR (100 MHz, CDCl3): δ = 164.6 (s), 161.0 (s), 149.2 (s), 149.0 (s), 145.1 (s), 138.4 (s), 136.7 (s), 133.2 (s), 130.1 (d), 129.7 (s), 128.6 (d), 128.2 (d), 124.9 (d), 123.2 (d), 116.6 (d), 93.5 (s), 83.3 (d), 52.6 (q), 52.5 (q), 38.9 (d), 23.6 (t), 22.7 (t), 12.3 (q).
MS (EI): m/z (%) = 524 (M+, 19), 492(100), 464(39), 432(19), 387(17), 260(23).
HRMS (EI): m/z calcd for C25H24N4O9, 524.1543; found, 524.1547.

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CCDC 207843-207847 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the CCDC 12 Union Road Cambridge CB2 1EZ UK; fax:+44(1223)336033; e-mail: deposit@ccdc.cam.ac.uk).

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2-(2-Oxo-propyl)-3,4-dihydro-2 H -azulen-1-one(5)
Yield: 28%; colorless oil.
IR(neat): 3028, 2922, 1711, 1697, 1435, 1267, 1140 cm-1.
1H NMR (400 MHz, CDCl3): δ = 6.77 (d, 1 H, J = 11.1 Hz), 6.55 (dd, 1 H, J = 11.1, 5.7 Hz), 6.17 (dd, 1 H, J = 9.9, 5.7 Hz), 5.39-5.46 (m, 1 H), 3.00-3.10 (m, 2 H), 2.79-2.92 (m, 3 H), 2.52 (dd, 1 H, J = 18.0, 9.7 Hz), 2.38(d, 1 H, J = 19.6 Hz), 2.18 (s, 3 H).
13C NMR (100 MHz, CDCl3): δ = 206.7 (s), 206.3 (s), 164.7 (s), 136.1 (s), 131.0 (d), 129.0 (d), 122.5 (d), 121.0 (d), 44.6 (t),43.8 (d), 37.5 (t), 31.1 (t), 29.9 (q).
MS (EI): m/z (%) = 202 (M+, 91), 159(100), 145(41).
HRMS (EI): m/z calcd for C13H14O2, 202.0994; found, 202.0997.

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For spectroscopic evidence of the generation of the ruthenium-carbenoid intermediate, see ref. [5j] and below:
To a solution of [RuII(TTP)(CO)] (50mg, 0.063mmol) in benzene (2mL) was added a solution of methyl 2-diazo-3,6-dioxoheptanoate(18.6mg, 0.094mmol) in benzene (1mL). The reaction mixture was stirred at 40 °C for 1 h, cooled to r.t. and concentrated under reduced pressure. The residue was washed with hexane and a small amount of MeOH to give the product as deep red solid (37mg, 61%) (Scheme [4] ).
1H NMR (400MHz, CDCl3): δ = 8.55 (s, 8 H), 7.99 (dd, 8 H, J = 10.0, 3.6 Hz), 7.49 (d, 8 H, J = 7.9 Hz), 2.67 (s, 12 H), 2.27 (s, 3 H), 1.6 (s, 3 H), 1.04 (t, 2 H, J = 6.9 Hz), -0.97 (t, 2 H, J = 6.9 Hz).
13C NMR (100MHz, CDCl3): δ = 283.8 (Ru=C).
MS (FAB): m/z (%) = 940 [M + H]+, 770.