An Improved Synthesis of Pyran-3,5-dione: Application to the Synthesis of ABT-598, a Potassium Channel Opener, via Hantzsch Reaction
摘要:
Ketoester 1 is cyclized to give pyran-3,5-dione 2 in 78% yield using a parallel addition of ketoester 1 and base NaOBu in refluxing THE Compared to the previously reported procedures, these optimized conditions have significantly increased the yield of this transformation and the quality of pyran 2 and prove to be suitable for large-scale preparation. An application of 2 to the synthesis of ABT-598, a potassium channel opener, is demonstrated.
Compounds of formula (I) as described herein, processes for their production and their use as pharmaceuticals.
本文件所述的式(I)化合物、其制备方法以及作为药物的用途。
An unexpected Bromolactamization of Olefinic Amides Using a Three-Component Co-catalyst System
作者:Yi An Cheng、Wesley Zongrong Yu、Ying-Yeung Yeung
DOI:10.1021/acs.joc.5b02390
日期:2016.1.15
between (N,N-dimethylamino)pyridine and isocyanate unexpectedly produced a three-component mixture. By using this mixture as an unprecedented three-component catalyst system, a facile and selective bromolactamization of olefinic amides has been developed. The protocol confers enhanced selectivity of N- over O-cyclization, leading to the formation of a structurally diverse range of lactams including both small
A Catalytic Asymmetric Synthesis of Polysubstituted Piperidines Using a Rhodium(I)-Catalyzed [2+2+2] Cycloaddition Employing a Cleavable Tether
作者:Timothy J. Martin、Tomislav Rovis
DOI:10.1002/anie.201301741
日期:2013.5.10
title reaction proceeds with a variety of alkyne substrates in good yield and high enantioselectivity. Upon reduction of the vinylogous amide in high diastereoselectivity (>19:1) and cleavage of the tether, N‐methylpiperidine products with functional group handles can be accessed (see scheme).
Lewis base-catalyzed [2,3]-Wittig rearrangement of silyl enolates generated from α-allyloxy carbonyl compounds is described. The [2,3]-Wittig rearrangement of silyl enolates generated from α-allylo...