From Simple to Complex: Rhodium(III)-Catalyzed C–C Bond Cleavage and C–H Bond Functionalization for the Synthesis of 3a,8b-Dihydro-1<i>H</i>-cyclopenta[<i>b</i>]benzofuran-1-ones
作者:Guiyu Guo、Saihong Wan、Xiaodong Si、Qijian Jiang、Yuanyuan Jia、Luo Yang、Wang Zhou
DOI:10.1021/acs.orglett.7b02052
日期:2017.10.6
A rhodium(III)-catalyzed strategy for the one-step synthesis of polysubstituted cis-3a,8b-dihydro-1H-cyclopenta[b]benzofuran-1-ones from simple 2′-hydroxychalcones and alkynes is developed. This novel transformation involves a sequential C–C bond cleavage and dehydrogenative annulation, leading to the product bearing a quaternary and a tertiary carbon center. 13C labeling experiments revealed that
提出了一种由铑(III)催化从简单的2'-羟基查耳酮和炔烃一步合成多取代的顺式-3a,8b-二氢-1 H-环戊[ b ]苯并呋喃-1-酮的策略。这种新颖的转变涉及到连续的C–C键断裂和脱氢环化反应,从而使产物带有一个四级和三级碳中心。13 C标记实验表明,CC键断裂不仅发生在C–C(C═O)键处,而且发生在C≡C键处。这项研究提供了一种使用C–C键断裂的替代策略,从而证明了该策略与C–H键功能化相结合的能力,可从简单的起始材料组装复杂的结构。