[EN] METHODS OF SYNTHESIS OF INGENOL AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉS DE SYNTHÈSE D'INGÉNOL ET DE SES INTERMÉDIAIRES
申请人:LEO LAB LTD
公开号:WO2014191457A1
公开(公告)日:2014-12-04
The present invention relates generally to methods of synthesis of diterpene heterocylic compounds. More particularly, the present invention relates to efficient methods of synthesis of ingenol (Formula (21), CAS 30220-46-3), from a compound of formula (1). The present invention also provides for various advantageous intermediates along the synthetic route of ingenol. Efficient synthesis of ingenol is important in the design and synthesis of related analogues, such as ingenol-3-angelate.
A New Method for the Preparation of Michael Adducts and Cyclic Enones Using Lithium Chloride-Hexamethylphosphoramide System.
作者:Yutaka OZAKI、Ayako KUBO、Kyouko OKAMURA、Sang-Won KIM
DOI:10.1248/cpb.43.734
日期:——
A new procedure using lithium chloride in hexamethylphosphoramide was found to be useful for the synthesis of Michael-type adducts and cyclic enones. Selectivity for the two products could be controlled by altering the reaction temperature employed. The urea-type solvents were also examined instead of hexamethylphosphoramide.
Novel ring expansion of cyclopentanones to seven membered rings
作者:Masakazu Tanaka、Hiroshi Suemune、Kiyoshi Sakai
DOI:10.1016/s0040-4039(00)82030-4
日期:1988.1
By treatment with BF3/ethyleneglycol, cyclopentanones with the carbonyl function at the C3-position of α-side chain undergo the ring cleavage to build up the seven membered rings, and this novel ringexpansion was applied to the synthesis of bulnesol.
Dityltin bis(triflate) is a mild Lewisacid which catalyzes clean Michael addition of enol silylethers. The new catalyst allows to employ various labile acceptors such as methyl vinyl ketone and 2-cyclopentenone which do not undergo smooth reaction with conventional Lewisacids. A variety of enol silylethers are also employable and thus 2-(trimethylsiloxy)propene, the simplest one in this class of
Calyciphylline B-type Alkaloids: Evolution of a Synthetic Strategy to (−)-Daphlongamine H
作者:Cedric L. Hugelshofer、Vignesh Palani、Richmond Sarpong
DOI:10.1021/acs.joc.9b02223
日期:2019.11.1
We provide a full account of our synthetic studies targeting the hexacyclic calyciphylline B-type alkaloids, a subfamily of the Daphniphyllum natural products. Following an initial set of syntheticstrategies focused on constructing the piperidine core of the calyciphylline B-type framework via a 6π-azaelectrocyclization, as well as exploiting the reactivity of underexplored oxazaborinine heterocycles