Phosphine‐Mediated Rauhut‐Currier‐Type/Acyl Transfer/Wittig Strategy for Synthesis of Spirocyclopenta[
<i>c</i>
]chromene‐Indolinones
作者:Sandip Sambhaji Vagh、Bo‐Jhih Hou、Athukuri Edukondalu、Pin‐Ching Wang、Yi‐Ru Chen、Wenwei Lin
DOI:10.1002/adsc.202100899
日期:2021.12.21
A phosphine-mediated reaction for the construction of spirocyclopenta[c]chromene-indolinones is reported via a Rauhut-Currier (RC)-type/acyl transfer/Wittig sequence. This methodology attributes the chemoselective phosphine addition to the alkynoate which generates the phosphorus zwitterion via RC-type reaction, and that further undergoes O-acylation to form the seven-membered betaine intermediate
通过Rauhut-Currier (RC) 型/酰基转移/Wittig 序列报道了用于构建螺环戊烷 [ c ] 色烯-吲哚酮的膦介导反应。该方法将化学选择性膦加成到炔酸酯上,通过RC 型反应生成磷两性离子,并在碱存在下进一步进行O-酰化以与酰氯形成七元甜菜碱中间体。广泛的调查表明,异常δ-酰化通过七元甜菜碱上的 CO 键断裂发生,随后的 Wittig 反应优先产生上述螺环化合物。此外,我们的协议还可以适用于不同的链烷酸酯,以提供一系列具有特权骨架的螺环五 [ c ]色酮。