Translating other people's posts: It is very risky, and IMO, not advisable, to purchase a basic economy ticket when you are connecting between airlines, especially with only 75 minutes to connect. If anything goes wrong, this could very quickly become very expensive.

Personally I would not risk this on any type of ticket without leaving at least 4-5 hours for the layover.

I strongly advise you to:

1) leave a longer time to connect when you are flying on different tickets

2) Buy a standard economy ticket so that if you do miss your connection, the agent assisting you has more options to help you other than selling you a walk up full priced Y ticket on a new flight.