In 33 AD, the Sadducees accepted only the Torah, or five Mosaic books. They rejected the prophets (plus angels, resurrection) and thus, our Lord.
I would personally not pin a date on this, because we seriously don’t know when it happened.
And while some later writers did claim that the Sadducees accepted only the Torah, it’s more likely that the historical Sadducees merely did not permit deductions from the other writings such as the prophets as answers to questions about legal or disciplinary matters or some such rather than reject these other books outright as being holy or special.
The Pharisees, accepting the full law and prophets, had less of an excuse in rejecting our Lord. And, in Matthew 23, Jesus condemned the Pharisees seven-fold, whereas He told the Sadducees only that they were “greatly mislead.”
I would actually interpret this in reverse: I actually see Jesus’ brief reply to the Sadducees that they are ‘mistaken’ to be a
harsher condemnation than His woes against the Pharisees.
Notice that in Jesus’ many debates against Pharisees, it is always matters of
discipline (as we Catholics would say) that is in issue. Most of His debates with the Pharisees centered more on legal and ethical issues (e.g., Is it legal to do this or that on a Sabbath? Is it okay to associate with ‘sinners’ or not? Can one in good conscience pay taxes to Rome?).
The only thing Jesus really condemned about the Pharisees was the
behavior of some of them, for not practicing what they preached. He does not so much condemn whatever teaching they believed as their failure to uphold that teaching. In fact, before His woes against the Pharisees, Jesus first acknowledges their authority and
commands His Jewish audience to observe what they teach: “The scribes and the Pharisees sit on Moses’ seat,
so do and observe whatever they tell you, but not the works they do.” (If that isn’t a divine stamp of approval, I don’t know what that is.

)
To put all of that in a nutshell:
Jesus condemned Pharisees for being hypocrites, not heretics.
It was only with the Sadducees that Jesus got embroiled in a debate centered on an explicitly
doctrinal question (the resurrection of the dead). And they are the ones who got an outright “You are
wrong” from the Son of God. That should be telling.
And guess which of the two made it past AD 70. I see the preservation of Pharisaic Judaism (pretty much the only strand of second-Temple Judaism that survived those harsh times - well, it
and Christianity) as well, God
preserving them. The Pharisees were not completely right of course since many of them did
not come to accept Jesus, but they were a close second in that they got most of the other stuff right, and I think God acknowledged that. Hey, if we believe the idea that the Jews as a whole will finally acknowledge Jesus before the end, then I think that’s the reason why God allowed them to survive.