Tetrahydrofuran derivatives having cis substituent, their intermediates, and their preparation method
申请人:Korea Institute of Science and Technology
公开号:US07388101B1
公开(公告)日:2008-06-17
The present invention relates to a tetrahydrofuran compound having cis substituents, the derivatives thereof and a process for preparing the same, and in particular relates to a dihydrofuran-3-ylidene triflate compound having cis substituents at C2 and C5 positions prepared through Prins-type cyclization using a homopropargylic alcohol derivative as a starting material in the presence of Lewis acid catalyst, a tetrahydrofuran compound having cis substituents at C2, C3 and C5 positions prepared through the hydrolysis of triflate group in the derivatives of the dihydrofuran-3-ylidene triflate compound, and a preparation method thereof.
The derivatives and the target tetrahydrofuran compound prepared according to the present invention are hydrofuran compounds with novel structures having cis substituents at C2, C3 and/or C5 positions, which are useful as a derivative for synthesizing drugs such as an antagonist for neurokinin receptor.
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