Compounds of the formula (I): ##STR1## and their pharmaceutically acceptable compositions are useful in inhibiting the activity of cyclic guanosine 3',5'-monophosphate phosphodiesterase.
Regioselectivity of Larock indole synthesis, a palladium-catalyzed heteroannulation between o-iodoaniline and internal acetylene, was estimated using acetylenes substituted with ester and/or Boc-protected amine at the homopropargylic position and with perbenzyl- and unprotectedglucose. Low to moderate regioselectivities were observed in all the cases, indicating these functional groups do not exert