NoobTraveler had a perfect blog post about this subject just a couple days ago.

Check it out here: ....noobtraveler.com/how-to-book-an-around-the-world-us-to-asia-star-alliance-award-ticket/

In the post he shows how to only use 65,000 UA miles to do the following itinerary:
New York - Seoul
Open jaw to Beijing
Beijing - Dubai (with a 6 hour layover in Bangkok)
Dubai - Boston (with a 12 hour layover in Zurich)

He also even demonstrates a SFO-NRT, SIN-IST, IST-LAX route which is pretty similar to your desired trip.