Substituted pyrrolo pyridines can be prepared by {HEAD ~ reduction} of {TAIL ~ the corresponding ketones} 
Substituted pyrrolo pyridines can be prepared by { HEAD ~ reduction } of { TAIL ~ the corresponding ketones }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL