5-Exocyclic Products, 2,3,5-Trisubstituted Tetrahydrofurans via Prins-Type Cyclization
作者:Satish N. Chavre、Hyunah Choo、Joo Hwan Cha、Ae Nim Pae、Kyung Il Choi、Yong Seo Cho
DOI:10.1021/ol061528x
日期:2006.8.1
[reaction: see text] 5-Exocyclic products, 2,3,5-trisubstituted tetrahydrofurans, were synthesized from homopropargylic alcohols with terminally substituted alkynes and various aldehydes via Prins-type cyclization. It is of interest that the exocyclic vinyl cation generated as a result of Prins-type cyclization could be trapped as a vinyl triflate when CH2Cl2 was used as a solvent, whereas in ethereal
[反应:见正文]通过Prins型环化反应,由均丙醇与末端取代的炔烃和各种醛合成5-外环产物2,3,5-三取代的四氢呋喃。令人感兴趣的是,当CH 2 Cl 2用作溶剂时,由Prins型环化产生的环外乙烯基阳离子可以三氟甲磺酸酯的形式被捕集,而在醚溶液中,乙烯基阳离子进行水解以得到相应的酮产物。