Shimano 11 speed stuff on 10 speed bike

[sworcester]

I want to build up a new bike. Have Shimano 10 speed shifters and 10 speed wheels, but having a hard time finding 10 speed derailleurs and cranks.

Can I use Ultegra 11 speed (non-Di2) cranks and front and rear derailleurs with 10 speeds shifters?

[spartanKid]

Cranks/rings yes, maybe FD, RD no.