An anomalous addition of chlorosulfonyl isocyanate to a carbonyl group: the synthesis of ((3a<i>S</i>,7a<i>R</i>,<i>E</i>)-2-ethyl-3-oxo-2,3,3a,4,7,7a-hexahydro-1<i>H</i>-isoindol-1-ylidene)sulfamoyl chloride
Beilstein journal of organic chemistry