I asked my Corpo Travel Agency if they would sell me the itinerary that you built yourself. This is what they sent me:

Legal Minimum Connecting Time at GRU (any airline connecting to TK) is 105 minutes:

STANDARD.D/D...D/I...I/D...I/I.
ONLINE 1.00 1.00 1.30 1.00
OFFLINE 1.00 1.00 1.30 1.00
** OR * ARE ALL
**-TK DI 1.45
TK-** ID 1.45
**-TK II 1.45
TK-** II 1.45

Flight schedule is as follows (95 minute layover at GRU):

FLIGHT DATE SEGMENT DPTR ARVL MLS EQP ELPD MILES SMD
1 TK 16 20MAY EZE GRU 2310 0150 ‡1 M 77W 2.40 1055 N
ARR-TERMINAL 3
21MAY GRU IST 0325 2210 M 12.45 6575 N
DEP-TERMINAL 3 ARR-INTERNATIONAL TERMINAL

Verification in the GDS: this connection is rejected due to minimum connecting time violation:

1 TK 16Y 20MAY 5 EZEGRU*SS1 2310 0150 21MAY 6 /DCTK /E
2 TK 16Y 21MAY 6 GRUIST*SS1 0325 2210 /DCTK /E

VCT*«
INVALID CONNECT TIME SEGS 1 AND 2 - MINIMUM IS 105 MINUTES

I fly from EZE to IST fairly frequently and normally the flight arrives into GRU ahead of schedule. However this does not change the fact that TK has a legal stand to reject the itinerary due to illegal connection time.

Sorry for not being able to tell you good news