“…115b Snyder and coworkers developed simple reagents such as 432, for direct halonium-induced polyene cyclizations. 122 Electronrich and -deficient terpenes derived from geraniol, farnesol, and nerol could be used for the synthesis of a diverse array of complexes with chlorine-, bromine-, and iodine-containing polycyclic frameworks. Total synthesis of many natural products are achieved with this protocol, such as peyssonol A, peyssonoic acid A (Scheme 116), and formal racemic total syntheses of aplysin-20, loliolide, and K-76.…”