New bile alcohols—synthesis of (22R)- and (22S)-5β-cholestane-3α,7α,12α,22,25-pentols 1,2
作者:Kihira Kenji、Kuramoto Taiju、Hoshita Takahiko
DOI:10.1016/0039-128x(76)90058-1
日期:1976.3
Abstract The synthesis of (22R)- and (22S)-5β-cholestane-3α,7α, 12α,22,25-pentols is described. Bisnorcholyl aldehyde was prepared from cholic acid and converted into the cholestanepentols by a Grignard reaction with 3-methyl-3-(tetrahydropyran-2-yloxy)-butynylmagnesium bromide followed by hydrogenation and acid hydrolysis. One of the synthetic pentols, the 22R-isomer was identical with a metabolite
MALIK, A. A.;SHARTS, C. M., J. FLUOR. CHEM., 41,(1988) N 3, C. 393-413
作者:MALIK, A. A.、SHARTS, C. M.
DOI:——
日期:——
Alkene Synthesis by Photocatalytic Chemoenzymatically Compatible Dehydrodecarboxylation of Carboxylic Acids and Biomass
作者:Vu T. Nguyen、Viet D. Nguyen、Graham C. Haug、Hang T. Dang、Shengfei Jin、Zhiliang Li、Carsten Flores-Hansen、Brenda S. Benavides、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.9b02951
日期:2019.10.4
O–H hydrogen atom transfer (HAT) and cobaloxime-catalyzed C–H-HAT processes. The reaction produces a variety of alkenes from readily available carboxylic acids. The reaction can be embedded in a scalable triple-catalytic cooperative chemoenzymatic lipase–acridine–cobaloxime process that allows for direct conversion of plant oils and biomass to long-chain terminal alkenes, precursors to bioderived polymers
Two synthetic routes are presented for the synthesis of bis- and tris-perfluoroalkenyloxy-substituted bile alcohols with an unsubstituted hydroxyl group in the hydrocarbon sidechain. The first route involves selective protection of the 24-hydroxyl group of 3α, 7α, 12α, 24-cholan-tetrol followed by the attachment of 3α, 7α, 12α-hydroxyl groups to the perfluoroalkenyloxy linkages and removal of the