Synthesis of 3-thienyl-substituted isothiazolines-2 and 1,2,4-thiadiazoles based on nitrile sulfides of the thiophene series
摘要:
The reaction of substituted alpha- and beta-thienylcarboxamides with chlorocarbonylsulfenyl chloride gave 5-thienyl-substituted 1,3,4-oxathiazol-2-ones. Decarboxylation of the latter by heating in o-dichlorobenzene generated in situ alpha- and beta-thienylnitrile sulfides, which in the presence of dipolarophiles [dimethyl fumarate, N-phenylmaleinimide, chloro(trichloro)acetonitrile] give the corresponding 3-thienyl-substituted DELTA2-isothiazolines and 5-chloromethyl(trichloromethyl)-1,2,4-thiadiazoles.
Synthesis of 3-thienyl substituted 2-pyrazolines by 1,3-dipolar cycloaddition
作者:M. M. Krayushkin、M. A. Kalik、S. A. Voznesensky
DOI:10.1007/bf00699146
日期:1994.1
have been prepared in high yields by the reaction of substituted,N-(P;-nitrophenyl)-3-thiophenecarbohydrazonoyl chlorides with Et3N in CH2Cl2 in the presence of an excess of a monosubstituted olefin. The reaction probably occurs as 1,3-dipolarcycloaddition of the corresponding 3-thiophenecarbonitrile imines formedin situ at the double bond of the olefin.