A general synthetic route of dihydroagarofuran sesquiterpenoid from α-(−)-santonin
摘要:
A general and efficient approach for synthesis of dihydroagarofuran sesquiterpenoid, the core structure of the polyol esters extensively present in the Celastraceae plants, has been developed by a series of transformations, which mainly include three creative and synthetically valuable conversions: the strategic double-bond shifting of 3, the versatile rearrangement of epoxide 5 generating two key functions, the C5-OH and 7,11-Double-bond, and the stereoselective cyclization/reduction of 8 constructing the tetrahydrofuran ring of 11. Thus the sesquiterpenoid 3 alpha,6 alpha,12-trihydroxy-dihydoagarofuran 1 was synthesized. (C) 1998 Elsevier Science Ltd. All rights reserved.
A general synthetic route of dihydroagarofuran sesquiterpenoid from α-(−)-santonin
摘要:
A general and efficient approach for synthesis of dihydroagarofuran sesquiterpenoid, the core structure of the polyol esters extensively present in the Celastraceae plants, has been developed by a series of transformations, which mainly include three creative and synthetically valuable conversions: the strategic double-bond shifting of 3, the versatile rearrangement of epoxide 5 generating two key functions, the C5-OH and 7,11-Double-bond, and the stereoselective cyclization/reduction of 8 constructing the tetrahydrofuran ring of 11. Thus the sesquiterpenoid 3 alpha,6 alpha,12-trihydroxy-dihydoagarofuran 1 was synthesized. (C) 1998 Elsevier Science Ltd. All rights reserved.
A Novel, Efficient, and Highly Selective O-Bn Bond Cleavage Reaction via a Rare K-Induced Electron Transfer Process
作者:Yong Qiang Tu、Lei Shi、Wu Jiong Xia、Fu Min Zhang
DOI:10.1055/s-2002-33519
日期:——
A new, efficient and highly selective deprotective method of both benzyl and benzylidene groups for protection of monohydroxyl and dihydroxyl, respectively, has been developed by using the system K-t-BuNH2-t-BuOH-18-crown-6. This method is valuable since it can not only selectively protect the TBDMS and THP groups and the ethylene ketal from cleavage, but also keep the separate or conjugated C=C bonds