synthesis of optically active trifluoromethyl dihydropyranones and spirocyclic oxindole-dihydropyranones has been realized by the chiral N-heterocyclic carbenes-catalyzed cyclization of α,β-unsaturated β-methylacyl chlorides with activated trifluoromethyl ketones or isatin derivatives.
光学活性的三
氟甲基二氢
吡喃酮和螺环的羟
吲哚-二氢
吡喃酮的直接合成已经通过手性N-杂环卡宾催化的α,β-不饱和β-甲基酰
氯与活化的三
氟甲基酮或
靛红衍
生物的环化反应而实现。