A flexible route to immunosuppressive agent FR252921. Asymmetric total synthesis of its (13R,14R,19R)-isomer
作者:Shouyun Yu、Feng Liu、Dawei Ma
DOI:10.1016/j.tetlet.2006.09.169
日期:2006.12
A flexible route to the proposed structure of FR252921, a novel immunosuppressive agent, is developed. The key elements include the assembly of its two P-hydroxy acid residues via asymmetric aldol condensation of N-acylthiazolidinethinones with aldehydes, and its triene part via a CuI/N,N-dimethylglycine catalyzed Sonogashira coupling and subsequent isomerization. Using this strategy (13R,14R,19R)-FR252921 is elaborated. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and Stereochemical Assignment of FR252921, a Promising Immunosuppressant
作者:J. Russell Falck、Anyu He、Hiroki Fukui、Hideyuki Tsutsui、Akella Radha
DOI:10.1002/anie.200700321
日期:2007.6.11
Total Synthesis of (±)-Deoxypenostatin A. Approaches to the Syntheses of Penostatins A and B
作者:Barry B. Snider、Tao Liu
DOI:10.1021/jo000850x
日期:2000.12.1
A short synthesis of (+/-)-deoxypenostatin A (28) has been carried out using the convergent coupling of dienal 11, epoxide 13, and methylenetriphenylphosphorane (17) to prepare trienol 19 in only two steps. The key step is the Yb(OTf)(3)-catalyzed intramolecular Diels-Alder reaction of hydrated trienyl glyoxylate 23, which gives lactone 24 stereoselectively. Elaboration of lactone 24 to enone 27 by