Well you have 4 options:
1. wake him up from the morning nap & then bump up the afternoon nap. Start with waking him up 1hr into the morning nap & over 3-4 days reduce it to 45mins & then 30mins until its non-existant & the afternoon nap is around noon
2. let him sleep in the morning & allow for a catnap in the afternoon. So that would mean waking him up so that his nap ends around 4.30pm... but again do it slowly so his body adjusts
3. Put him back on 1 nap & do an earlier bedtime. 1.5hrs is actually quiet good for 1 nap... alot of babies start off with a 45min nap when they go down to 1 nap & then it increases to 1.5-2hrs long
4. Let him sleep as long as he is sleeping at the moment during the day & accept the later bedtime
He is at the moment sleeping 3hrs during the day & 10hrs at night so thats just about right for his age. I understand he is cranky at the moment when you wake him but I think if you do it at least 3 days in a row, hopefully he will start making up for sleep at night & his body will get used to sleeping less during the day & more at night.
hth a little & let me know how you go
Layla