Oxidation of Olefins with Benzeneseleninic Anhydride in the Presence of TMSOTf
作者:Izabella Jastrzębska、Maja Morawiak、Joanna E. Rode、Barbara Seroka、Leszek Siergiejczyk、Jacek W. Morzycki
DOI:10.1021/acs.joc.5b00410
日期:2015.6.19
been shown that different products are formed with this species depending on the specific structure of olefin. The 1,1-disubstituted olefins afforded mostly α,β-unsaturated carbonyl compounds. The sterically encumbered tri- or tetrasubstituted olefins yielded 1,2- or 1,4-dihydroxylated products, presumably via four-membered cyclic intermediates.
Facile intramolecular ene reactions of steroidal unsaturated acyloins
作者:Brian A. Marples、Christopher D. Spilling
DOI:10.1016/s0040-4020(01)88481-7
日期:1992.1
relatively low temperature (200°C) intramolecularenereaction of 4,5-seco-5β-cholest-3-en-5-ol-6-one followed by in situ rearrangement affords 3-methl-B-nor-5β-cholest-2-en-4-one and 5-hydroxy-5β-cholestan-6-one and supports the view that 3β-methyl-A-nor-5β-cholestan-5-ol-6-one arises from 3β-tosyloxy-5ξ-cholestane-5,6β-diols in the presence of KOBuτ by similar enereactions.
A novel ring contraction: 3β-methyl-A-nor-5β-cholestan-5-ol-6-one from 3β-tosyloxy-5α-cholestane-5,6β-diol through an ene reaction of an unsaturated acyloin
A by-product of the reaction of 3β-tosyloxy-5α-cholestane-5,6β-diol with , 3β-methyl-A-nor-5β-cholestan-5-ol-6-one, is believed to arise from the intramolecularenereaction of 4,5-seco-cholest-3-en-6β-ol-5-one.
Inhibitors and stimulators of cholesterolgenesis enzymes. Structure-activity study in vitro of amino and selected nitrogen-containing analogs of 5.alpha.-cholestane-3.beta.,5.alpha.,6.beta.-triol
作者:Donald T. Witiak、Roger A. Parker、Mary E. Dempsey、Mary C. Ritter