"We are working on how we can add substance to the different pillars of IPEF ... We hope there will be something to announce by the time of the APEC summit," Lawrence Wong told Washington's Center for Strategic and International Studies after talks with U.S. officials this week.

"In areas like supply chains, green economy, digital economy; these are things that we are pursuing, and we hope certainly that there can be some substantial progress."

U.S. President Joe Biden launched IPEF as part of efforts to step up economic engagement with Asia to compete with China after his predecessor, Donald Trump, pulled out of a pan-Pacific trade pact, but it lacks the market-access provisions Asian states want.

Wong, who is also Singapore's finance minister, said that given it may be difficult in some instances to get consensus among all 14 IPEF members, Singapore had said its bilateral cooperation with the United States could be a "pathfinder" for others to follow.

"We set high standards, it can be a pathfinder, it can be a test-bed that we do together before it is expanded to the broader region," he said.

Sources familiar with plans for IPEF discussions at APEC say there is hope countries could agree to language around the third and fourth pillars of the framework, which deal with clean energy and decarbonization as well as anti-corruption.

The first pillar on trade could prove too far a bridge for a November consensus, they say, and talks on the second pillar, involving supply chains, were largely agreed in May.

The summit meetings of the 21-member APEC forum will take place in the week of Nov. 11-17 in San Francisco.

Wong said Singapore would like to see more far-reaching agreements with the United States, including market access and trade liberalization, but recognized "there's no mood to talk about these issues" at the moment in the U.S. given its domestic political environment.

"But I think we should maintain high ambition and hopefully down the road, in years to come, the conditions may change."