Organic chemistry question?

Question

The question is here:
http://ca.blog.360.yahoo.com/blog-LDLB08k9fqL4u3yfbggy

How can you combined the four molecules on the left to make the one on the right?

Answer 1

It looks like an ene-yne metathesis (between the alkyne and bromopentene) followed by Diels-Alder [4+2] cyclization of the resulting diene with cyclopentene. There is also an SN2 displacement of the primary bromide by benzylamine at some point. Look up the Grubbs I or II Ru catalysts for the ene-yne metathesis. Is this a "one pot" reaction, or are several steps involved? In theory all could be accomplished in "one pot."

-Cheers