You cannot TF Diners to QF even indirectly. Your best bet is to TF to Starwood. 100K Diners = 50K Starwood which you can use to book Starwood hotels. Alternatively, you can transfer Starwood pts in multiples of 20K to get 20+5=25K AA miles; so you can get to 60K AA miles which you can then use to book oneworld awards including QF awards. The 100K Diners can also be converted directly to 50K krisflyer miles to book flights on SQ. Hope this helps.