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

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Abstract
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 by reduction and dehydration. The 13C nmr data for all the above products are also reported.