Synthetic studies toward gelsemine. 2. Preparation of the tetracyclic skeletal part by way of a highly stereospecific intramolecular reaction of a silyl enol ether with an N-acyliminium ion
Synthetic studies toward gelsemine. 2. Preparation of the tetracyclic skeletal part by way of a highly stereospecific intramolecular reaction of a silyl enol ether with an N-acyliminium ion