Abstract
Reaction of enynes 1 and 3 with Co 2(CO) 8 in the presence of DMSO, NMO or TMANO as promoters produced tricyclic indolidine derivatives 5 and 7 stereoselectively in moderate to excellent yield. The stereochemistry at the C-7 position of the indolidines 5 and 7 was confirmed by their conversion into the bridged azacycles 10 and 13 .
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