diastereoselective rhodium(I)-catalyzed intramolecular conjugate addition (Hayashi–Miyaura reaction) of robust and easily handled 4-pinacolboronic ester D-tryptophan derivatives tethering an activated alkene as the acceptor. This methodology provides, access to the functionalized chiral tricyclic core of the ergoline skeleton diastereoselectivity and allows further modification for the cyclization of the fused
The synthesis of a series of compounds indolo[4,3-fg]quinazoline related to ergoline (indolo[4,3-fg]quinoline) is reported. The key step of the synthetic sequence is the ring cleavage of the ketone IV. The stereochemistry of the chiral centers is established by the chirality of dihydrolysergicacid I.