>> bb/143719@139337
Have you seen this article?
https://www.researchgate.net/publication/228480633_A_solvent-free_and_formalin-free_Eschweiler-Clarke_methylation_for_amines;
Paraform + oxal, or is it also not an option due to the Picte-Spengler reaction? Like, whatever the reagents, you can't avoid that?