Adamantane-based nitrile sulfides: the generation of the synthetic equivalent of the first bis(nitrile sulfide)

The reaction of 1,3-adamantanedicarbonamide with chlorocarbonylsulfenyl chloride in hot toluene gives two new oxathiazolone derivatives that have had their structures confirmed crystallographically: 1,3-bis(1,3,4-oxathiazol-2-on-5-yl)-adamantane and 1 -cyano-3-(1,3,4-oxathiazol-2-on-5-yl)-adamantane. (Crystal data: C 10 H 14 (COC(O)SN) 2 : P2 1 /m, a = 10.447(2), b = 7.119(3), c = 10.684(2) Å, β = 112.98(1)°, V = 731.5(3) Å 3 , z = 2, D c = 1.536 g cm −3 , R = 0.034, R w = 0.029; (NC)C 10 H 14 (COC(O)SN): P2 1 /c, a = 9.153(2), b = 19.134(2), c = 7.130(3) Å, β = 105.38(2)°, V = 1204(1) Å 3 , z = 4, D c = 1.447 g cm −3 , R = 0.038, R w = 0.035.) The reaction of the precursor with dimethyl acetylenedicarboxylate (DMAD) in refluxing chlorobenzene gave a mixture that was resolved into pure compounds by Kugelrohr sublimation; these were shown to be sulfur, tetramethyl thiophenetetracarboxylate, 1,3-adamantanedinitrile, 1,3-bis(4,5-bis(methoxycarbonyl)-isothiazol-3-yl)-adamantane, and 1-cyano-3-(4,5-bis(methoxycarbonyl)-isothiazol-3-yl)-adamantane. The structures of the two new isothiazole derivatives were confirmed crystallographically. (Crystal data: C 10 H 14 (CNS*DMAD) 2 : Pca2 1 , a = 15.857(4), b = 11.562(4), c = 13.602(4) Å, V = 2494(2) Å 3 , z = 4, D c = 1.424 g cm −3 , R = 0.057, R w = 0.038; C 10 H 14 (CN)(CNS*DMAD): P2 1 /c, a = 19.683(2), b = 11.566(3), c = 7.727 (3) Å, β = 93.30(2)°, V = 1756(1) Å 3 , z = 4, D c = 1.363 g cm −3 , R = 0.079, R w = 0.076.) The pattern of reactivity indicates that the syntheticequivalent of the bis(nitrile sulfide) may be present in solution but has a very short lifetime and failed to react at all with 1,3-adamantanedinitrile. Keywords: oxathiazolone, nitrile sulfide, cycloaddition, isothiazole.