Should I ask a journal for provided peer review when a corresponding author will not share communications? This question stems from a broader question at:

How to deal with corresponding authors not sharing submission steps? (E.g. Peer reviews &amp; Decisions)

I often run into the uncomfortable situation where a corresponding author will not share details about received peer review and editorial decisions. I am not sure how common such a situation is, and what is the best procedure to follow.  

This happened where I was not the first author however I did much (if not most) of the writing and data analysis. Therefore I feel more than just entitled to read and discuss reviewers' comments. At least once I was left with the impression that no strict peer review actually took place (on a paper where the PI was friends with the handling editor).

I was wondering whether it would be appropriate if I directly contacted the journal seeking to receive the provided peer review and editorial decision. (After requesting and being ignored by both the first &amp; corresponding author(s)).
No, it's not appropriate. The whole peer-review system relies on the corresponding author's trustworthiness. Asking the journal to provide reviews to other authors is an implicit allegation that the corresponding author is not fulfilling their duties or possibly even engaged in misconduct. Unless there is actual misconduct involved or the corresponding author no longer available (e.g., sick) other authors should never contact the journal. Bringing this lack of communication among authors to the journal's attention is the last resort and will not only cost you a collaboration (and thereby make an enemy) but probably also prevent the publication. 

It even would be more appropriate to contact the corresponding author's superiors, although that would be a nuclear option too.

I would have a frank discussion with the corresponding author. I might even say that this could be the last collaboration if they don't start taking me serious.