A compound of the formula (I): ##STR1## salt thereof, or hydrate thereof which can effectively be absorbed from the lymph vessel in the intestinal tract and transferred to the lymph node in a high concentration is provided.
Visible-Light Photocatalytic Preparation of 1,4-Ketoaldehydes and 1,4-Diketones from α-Bromoketones and Alkyl Enol Ethers
作者:William H. García-Santos、Jeferson B. Mateus-Ruiz、Alejandro Cordero-Vargas
DOI:10.1021/acs.orglett.9b01275
日期:2019.6.7
A Ru2+-photocatalyzed, visible-light-mediated ATRA reaction for the straightforward preparation of 1,4-ketoaldehydes, 1,4-diketones, and 1,4-ketoesters, which are of difficult access by other means, is reported herein. This method employs readily accessible α-bromoketones and alkyl vinyl ethers as starting materials, allowing the construction of secondary, tertiary, and challenging quaternary centers
Asymmetric Synthesis of Cyclic Hydroxy Ketones Derived from Enol Ethers via Sharpless Asymmetric Dihydroxylation. A Study in the Correlation of the Enol Ether Chain Length and Enantioselectivity
作者:Benjamin F. Marcune、Sandor Karady、Paul J. Reider、Ross A. Miller、Mirlinda Biba、Lisa DiMichele、Robert A. Reamer
DOI:10.1021/jo034854o
日期:2003.10.1
The Sharpless asymmetric dihydroxylation reaction of enolethers derived from their corresponding cyclic ketones, gave alpha-hydroxyketones with high enantioselectivity. The enantiomeric excess was found to be proportional to the length of the unbranched enolether chain with a maximum ee for the pentyl enolether. An efficient synthesis of alpha-hydroxy chromanone in >90% ee was demonstrated using
The application of cyclic and acyclic enol ethers as electrophiles in cross coupling reactions offers new possibilities for the preparation of functional compounds.