Radical Cyclization of Epoxy Vinyl- and Allylsulfones Promoted by Titanocene Chloride
摘要:
A titanocene-mediated intramolecular radical addition of different epoxy vinyl- and allylsulfones has been achieved. Five- and Six-membered ring products were obtained in good to excellent yields in the presence of both 2.2 and 0.2 equiv of Cp2TiCl. A novel double-activation strategy allowed us to achieve small-size rings such as cyclobutanes and cyclopropanes.
Enantioselective Total Synthesis of Cannabinoids—A Route for Analogue Development
作者:Zachary P. Shultz、Grant A. Lawrence、Jeffrey M. Jacobson、Emmanuel J. Cruz、James W. Leahy
DOI:10.1021/acs.orglett.7b03668
日期:2018.1.19
A practical synthetic approach to Δ9-tetrahydrocannabinol (1) and cannabidiol (2) that provides scalable access to these natural products and should enable the generation of novel synthetic analogues is reported.
Provided are synthesis processes and intermediates for preparing cannabinoids and analogs.
提供了制备大麻素和类似物的合成过程和中间体。
Widely Applicable Hydrofluorination of Alkenes via Bifunctional Activation of Hydrogen Fluoride
作者:Zhichao Lu、Xiaojun Zeng、Gerald B. Hammond、Bo Xu
DOI:10.1021/jacs.7b12704
日期:2017.12.20
Expanding the use of fluorine in pharmaceuticals, agrochemicals and materials requires a widely applicable and more efficient protocol for the preparation of fluorinated compounds. We have developed a new generation nucleophilic fluorination reagent, KHSO4-13HF, HF 68 wt/wt %, that is not only easily handled and inexpensive but also capable of hydrofluorinating diverse, highly functionalized alkenes
Stereoselective reductions of N-Boc-hexahydro-1H-indolin-5(6H)-ones
作者:Michael A. Brodney、Marcus L. Cole、Jamie A. Freemont、Stella Kyi、Peter C. Junk、Albert Padwa、Andrew G. Riches、John H. Ryan
DOI:10.1016/j.tetlet.2007.01.078
日期:2007.3
stereoselectivity of reduction of the enamide moiety of N-Boc-hexahydro-1H-indolin-5(6H)-ones. Under ionic reduction conditions (triethylsilane/trifluoroaceticacid) the enamide group of 3a-methyl-N-Boc-hexahydro-1H-indolin-5(6H)-one was reduced to afford exclusively a cis ring-fused product. For the 3a-phenyl substituted analogue more forcing conditions (sodiumcyanoborohydride at pH 2–2.5) were required