Densely substituted styryl sulfone 20 is shown to undergo double annulation with phthalide 21 to give, in one-pot operation and in excellent yield, the benzonaphthopyranone scaffold 22 of gilvocarcins.
                                    密集取代的
苯乙烯基砜20已显示与
邻苯二甲酸酯21进行双环化,以一锅操作并以优异的收率得到了gilvocarcins的苯并
萘并
吡喃酮支架22。