Synthesis of 6-methoxy-2,2-dimethyl-2H-1-benzothiopyran and 6,7-dimethoxy-2,2-dimethyl-2H-1-benzothiopyran, sulfur analogues of precocene I and precocene II

Article abstract of DOI:10.1002/jhet.5570200456

Preparation of title compounds 5, sulfur analogues of the natural insect antijuvenile hormones precocene I and II, is described. The synthetic pathway involves conversion of the appropriate thiophenol 2 into the corresponding thiochroman-4-one 4 followed