Method for preparing formamide compounds

A process for preparing formamide compounds of formula (I):

• in which
• R1 and R2 represent independently of one another a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, a heterocycle, a silyl group, a siloxy group, an amino group, an aldimine of formula —N═CHR6, or a ketimine of formula —N═CR6R7, said alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocycle, silyl, siloxy, and amino groups being optionally substituted, or
• R1 and R2, together with the nitrogen atom to which they are bonded, form an optionally substituted heterocycle, or
• R1 and R2, with the nitrogen atom to which they are bonded, form a carbon-nitrogen double bond (N═C), thus giving an aldimine of formula —N═CHR6 or a ketimine of formula —N═CR6R7, and
• R6 and R7 represent independently of one another a hydrogen atom, an alkyl group, an alkenyl group, an akynyl group, an aryl group, a heteroaryl group, a heterocycle, a silyl group, a siloxy group, or an amino group, said alkyl, alkenyl, akynyl, aryl, heteroaryl, heterocycle, silyl, siloxy, and amino groups being optionally substituted,
• characterized in that an amine of formula (II) in which R1 and R2 are as defined above,
• is reacted with CO2 in the presence of a catalyst and with a silane compound of formula (III)
• in which
• R3, R4 and R5 represent independently of one another a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a silyl group, a siloxy group, an aryl group, or an amino group, said alkyl, alkenyl, alkynyl, alkoxy, silyl, siloxy, aryl, and amino groups being optionally substituted, or
• R5 is as defined above and R3 and R4, together with the silicon atom to which they are bonded, form an optionally substituted, silyl-containing heterocycle.