No. Here's what Iaijutsu Strike says:
A sword saint can perform a lightning quick iaijutsu strike against the target of his challenge to inflict devastating wounds while drawing his sword. After the sword saint has challenged a foe but before he has attacked the target of his challenge, he may choose to use his iaijutsu strike as a full-round action, making an attack roll with his weapon as normal. In order to use this ability, the sword saint’s weapon must be sheathed at the start of his turn. If he successfully hits his opponent with an iaijutsu strike, his attack deals an additional +1d6 points of damage. This bonus damage increases by an additional +1d6 at 3rd level and every two levels thereafter to a maximum of +10d6 damage at 19th level. Any extra damage as a result of a successful iaijutsu strike is not multiplied by a critical hit.
After making an iaijutsu strike, a sword saint takes a –4 penalty to his AC until his next turn, but his weapon is now drawn and he may continually to fight normally. Regardless of whether he hits his opponent with the iaijutsu strike, a sword saint cannot use this ability on the same foe more than once per day.
At 10th level, a sword saint learns to focus faster and is able to make an iaijutsu strike as a standard action, and the penalty to his AC is reduced to –2. This ability replaces a samurai’s mount.
Here's what Vital Strike says:
When you use the attack action, you can make one attack at your highest base attack bonus that deals additional damage. Roll the weapon’s damage dice for the attack twice and add the results together before adding bonuses from Strength, weapon abilities (such as flaming), precision-based damage, and other damage bonuses. These extra weapon damage dice are not multiplied on a critical hit, but are added to the total.
Using Iaijutsu Strike is a Full Round Action (or a Standard Action @ 10th Level). Vital Strike is an Attack Action, a type of Standard Action. Since Vital Strike is done as part of an Attack Action (not a Standard or Full Round Action), the benefits of Vital Strike would not apply to the Iaijutsu Strike.
No. Here's what Iaijutsu Strike says:
A sword saint can perform a lightning quick iaijutsu strike against the target of his challenge to inflict devastating wounds while drawing his sword. After the sword saint has challenged a foe but before he has attacked the target of his challenge, he may choose to use his iaijutsu strike as a full-round action, making an attack roll with his weapon as normal. In order to use this ability, the sword saint’s weapon must be sheathed at the start of his turn. If he successfully hits his opponent with an iaijutsu strike, his attack deals an additional +1d6 points of damage. This bonus damage increases by an additional +1d6 at 3rd level and every two levels thereafter to a maximum of +10d6 damage at 19th level. Any extra damage as a result of a successful iaijutsu strike is not multiplied by a critical hit.
After making an iaijutsu strike, a sword saint takes a –4 penalty to his AC until his next turn, but his weapon is now drawn and he may continually to fight normally. Regardless of whether he hits his opponent with the iaijutsu strike, a sword saint cannot use this ability on the same foe more than once per day.
At 10th level, a sword saint learns to focus faster and is able to make an iaijutsu strike as a standard action, and the penalty to his AC is reduced to –2. This ability replaces a samurai’s mount.
Here's what Vital Strike says:
When you use the attack action, you can make one attack at your highest base attack bonus that deals additional damage. Roll the weapon’s damage dice for the attack twice and add the results together before adding bonuses from Strength, weapon abilities (such as flaming), precision-based damage, and other damage bonuses. These extra weapon damage dice are not multiplied on a critical hit, but are added to the total.Using Iaijutsu Strike is a Full Round Action (or a Standard Action @ 10th Level). Vital Strike is an Attack Action, a type of...
Actually I think if this isn't an absolute ruling (which I can't find anywhere that it is) then it should honestly be DM discretion. Attack action is a sub-type of a standard action, and Iaijutsu Strike is a standard action that a DM could easily see as an attack action because it is a combative attack type of a standard action. Anything set to a standard action could be categorized into one of the sub-type actions. Though I can definitely see why a DM might crush the marrying of this feat and ability, with all the right Vital Strike and crit feats including some mythic versions and maybe some tweaks here and there to certain things you could probably cleave a mountain in two with this combination.
The Necro is strong.
Nothing good ever combines with Vital Strike :(
There is a feat that allows you to combine Improved Vital Strike with Cleave and Great Cleave.
Actually I think if this isn't an absolute ruling (which I can't find anywhere that it is) then it should honestly be DM discretion. Attack action is a sub-type of a standard action, and Iaijutsu Strike is a standard action that a DM could easily see as an attack action because it is a combative attack type of a standard action. Anything set to a standard action could be categorized into one of the sub-type actions. Though I can definitely see why a DM might crush the marrying of this feat and ability, with all the right Vital Strike and crit feats including some mythic versions and maybe some tweaks here and there to certain things you could probably cleave a mountain in two with this combination.
Iaitsu Strike is a non-reactive (ex) ability that has an action cost of either a full-round action or a standard action (based on level), thus, you have to specifically declare the Use Extraordinaty Ability action (from the Actions in Combat table) to perform it.
Since "Use Extraordinary Ability" is not the "Attack" action, you cannot use Vital Strike.
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Even if Vital Strike did apply, they'd nerf it. The combination would be broken.
Iaijutsu Strike is a strong ability, if you can actually manage to execute it in combat. Beware, that class is hard to use, given that the strike must be with a one-handed weapon wielded in one hand (without shield or paired weapon) and it only works if no weapons are wielded before you preform it.