しようとして

trying to; attempting to

→ 為る
phrase Rare #39,685
trying to; attempting to Formed from the volitional form しよう of する plus として. It expresses an attempt to do something and is often followed by いる, も, or another verb or expression.
JA: 君がそれを否定しようとしても無駄です。
EN: Even if you try to deny it, it is useless.

君がそれを否定しようとしても無駄です

There's no point in your trying to deny it.

彼女は手に余ることをしようとして笑われた

She was laughed at for trying to bite off more than she could chew.

何もかも買収しようとして応じなかったのは殺された

Those who refused to go along with the attempt to buy everything off were killed.

— ロシアン・ブラザー (1997)