Addition reactions of (phenylsulfonyl)propadiene with 1-pyrrolidinyl enamines of cyclic ketones: syntheses and reactions of 1,3-dienes possessing an allyl sulfone moiety
Different substituted furans are syntetised by cyclization of 4-pentynones using potassium tert-butoxide in DMF. A different reaction pattern is observed when the same compounds were treated with sodium methoxide in MeOH. A new approach to 2-propargyl-carbonyl compounds is also proposed.