The present invention relates to a preparation method for and an application of a chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand SpiroPNP and an iridium catalyst Ir-SpiroPNP thereof. The chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand is a compound represented by formula I, or a racemate or optical isomer thereof, or a catalytically acceptable salt thereof, and the main structural feature is a phosphine ligand having a chiral spiro indene skeleton and a large sterically hindered substituent. The chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand can be synthesized into a chiral starting material from a 7-diaryl/alkylphosphino-7′-amino-1,1′-spirodihydroindenyl compound having a spiro ring skeleton. The iridium catalyst of the chiral spirocyclic phosphino-7′-amino-1,1′-spirodihydroindenyl compound having a sprio ring skeleton. The iridium catalyst of the chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand is a compound represented by formula II, or a racemate or optical isomer thereof, or a catalytically acceptable salt thereof. The iridium catalyst can be used to catalyze the asymmetric catalytic hydrogenation of carbonyl compounds, and especially in the asymmetric catalytic hydrogenation of simple dialkyl ketones. Said catalyst exhibits high yield (>99%) and enantioselectivity (up to 99.8% ee), thus having practical value.

##STR00001##

The present invention relates to a preparation method for and an application of a chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand SpiroPNP and an iridium catalyst Ir-SpiroPNP thereof. The chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand is a compound represented by formula I, or a racemate or optical isomer thereof, or a catalytically acceptable salt thereof, and the main structural feature is a phosphine ligand having a chiral spiro indene skeleton and a large sterically hindered substituent. The chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand can be synthesized into a chiral starting material from a 7-diaryl/alkylphosphino-7′-amino-1,1′-spirodihydroindenyl compound having a spiro ring skeleton. The iridium catalyst of the chiral spirocyclic phosphino-7′-amino-1,1′-spirodihydroindenyl compound having a sprio ring skeleton. The iridium catalyst of the chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand is a compound represented by formula II, or a racemate or optical isomer thereof, or a catalytically acceptable salt thereof. The iridium catalyst can be used to catalyze the asymmetric catalytic hydrogenation of carbonyl compounds, and especially in the asymmetric catalytic hydrogenation of simple dialkyl ketones. Said catalyst exhibits high yield (>99%) and enantioselectivity (up to 99.8% ee), thus having practical value.

##STR00001##