277-Pyran, tetrahydro-2,3-dichloro

Pyran, 3,4-dihydro-, 55, 63 Pyran, tetrahydro-, 2,3-dichIoro- [2//-Pyran, tetrahydro-, 2,3-dichloro-], 55, 63 Pyran, tetrahydro-, 3-chloro-2-methyl- [2H-Pyran, tetrahydro-, 3-chloro-2-methyl-], 55 63... 

C8H12Ct2 2,5-dichloro-2,5-dimethyl-3-hexyne 2431-30-3 451.15 39.211 1,2 14365 C8H1202 tetrahydro-2-(2-propynyloxy)-2H-pyran 6089-04-9 451.90 39.282 2... 

The Ma group devised a facile, an inexpensive, and a metal-free synthesis of pyridazino[4,5-l>][l,4]thiazine-diones 27 via a Smiles rearrangement, obtaining the desired products in high yields (Scheme 11) (13TL3253). Optimal reaction conditions were determined to be treatment of 4,5-dichloro-2-(tetrahydro-2f/-pyran-2-yl)pyridazin-3(2fJ)-one 28 with an N-substituted mercaptoacetamide 29 at room temperature in the presence of cesium carbonate as the base and N,ALdimethylformamide (DMF) as the solvent. The authors foresee future applications of this method to the preparation of biologically active compounds. 

C2 Ha aBrNOa 9 2-p-Bromophenyl-4a,5,5a,6,7,8,9,9a,10,10a-decahydro-5a-methyl-10a-morpholino-4H-naphtho[2,3-b]pyran, 40B, 336 C211H3fiNeO, N,N -Bis-(2-cyanoethyl)-l, 10-diaza-4,7,13,16-tetraoxa-cyclo-octadecane malononitrile complex, 45B, 417 C25H20CINO13, 6,7-Bis(methoxycarbonyloxy)-l,2,3,4-tetrahydro-iso-quinoline-[1,2-c]-oxazol-2-one-[3,4-b]-1-chloro-3-methoxycarbonyl-oxy-6,7-methylenedioxyindane, 45B, 418 C2 5H21 Cl2NO, 3-(3,5-Dichloro-2,4,6-trimethylphenyl)-4-diphenylmeth-ylene-2-isoxazoline, 42B, 283... 

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