Figure 3: Catalytic reductive formylation and methylation of amines with CO2 as C1 source.
From: Using carbon dioxide as a building block in organic synthesis

(a,b) Organocatalytic formylation of amines with CO2 using silanes as the reductants. (c) Ru-catalysed methylation of amines with CO2 using silanes as the reductants. (d,e) Ru-catalysed methylation of amines with CO2 using H2 as the reductant.