Sequential [3,3]Sigmatropic Rearrangement: Regioselective Synthesis of Dimedone‐Annulated Heterocycles
作者:S. K. Samanta、K. C. Majumdar
DOI:10.1080/00397910500518924
日期:2006.5
Abstract The [3,3]sigmatropic rearrangement in the 3‐(4′‐aryloxybut‐2′‐ynyl)mercapto‐5,5‐dimethyl cyclohex‐2‐enones afforded a number of 4‐aryloxymethyl‐7,7‐dimethyl‐6,7,8‐trihydrothiochrom‐3‐en‐5‐ones (70–80%), which underwent second [3,3]sigmatropic rearrangement to furnish benzofuro[3,2‐c][1]‐2,3,4,6,6a,11a‐hexahydro‐3,3,11a‐trimethylthiobenzopyran‐2‐ones (60–70%).