In my wishful thinking I made an error , sorry about that, as for the arylsulfonylnitromethane synthesis , alI can gather it's a type of Merrifield resin bound nitroacetate and I wasn't able to locate a reference that may have something to do with their preparation.....java
An efficient procedure for the esterification of nitroacetic acid : application for the preparation of Merrifield Bound nitroacetate
J. Org. Chem. 46, 765, 1981
( not able to locate this reference)