http://pharmacist8.tripod.com/OH-trypt.pdf (http://pharmacist8.tripod.com/OH-trypt.pdf)
http://www.erowid.org/library/books_online/tihkal/tihkal30.shtml (http://www.erowid.org/library/books_online/tihkal/tihkal30.shtml)
.http://www.erowid.org/library/books_online/tihkal/tihkal49.shtml (http://www.erowid.org/library/books_online/tihkal/tihkal49.shtml)
Shulgin has a word on them. It appear that the tertiary-butyl analogue, NTBT, is a GHB like intoxicant, but the other are likely not active with a straight indole ring. But the 5-MeO-mono-N-alkyl-tryptamines are active according to my ref, with the exception of 5-MeO-NMT, which is Tihkal#42http://www.erowid.org/library/books_online/tihkal/tihkal42.shtml (http://www.erowid.org/library/books_online/tihkal/tihkal42.shtml)
and is indeed not active. According to my paper it has an activity of 3-10 in the usual serotonin test, 10 being inactive, but the 5-MeO-NET, which is not in Tihkal, has an activity of 0.1, that is in the same range that DMT/DET etc... It should bee active in the man.