The asymmetric synthesis of (3R)-N-methyl-2-oxo-[1,4′-bipiperidine]-3-acetamide in quantity
摘要:
The asymmetric synthesis of the enantiomerically pure bipiperidine core fragment of a potent dual NK1/NK2 antagonist is described. The utilization of a diastereoselective Michael addition employing Evens' auxiliary as the key step allowed for the preparation of the fragment on a multi-kilogram scale. (C) 2002 Published by Elsevier Science Ltd.
Site-Selective Aliphatic C–H Chlorination Using <i>N</i>-Chloroamides Enables a Synthesis of Chlorolissoclimide
作者:Ryan K. Quinn、Zef A. Könst、Sharon E. Michalak、Yvonne Schmidt、Anne R. Szklarski、Alex R. Flores、Sangkil Nam、David A. Horne、Christopher D. Vanderwal、Erik J. Alexanian
DOI:10.1021/jacs.5b12308
日期:2016.1.20
functionalization of aliphatic C-H bonds remain a paramount goal of organic synthesis. Free radical alkane chlorination is an important industrial process for the production of small molecule chloroalkanes from simple hydrocarbons, yet applications to fine chemical synthesis are rare. Herein, we report a site-selective chlorination of aliphatic C-H bonds using readily available N-chloroamides and apply this transformation
A Chlorine-Atom-Controlled Terminal-Epoxide-Initiated Bicyclization Cascade Enables a Synthesis of the Potent Cytotoxins Haterumaimides J and K
作者:Sharon E. Michalak、Sangkil Nam、David M. Kwon、David A. Horne、Christopher D. Vanderwal
DOI:10.1021/jacs.9b04702
日期:2019.6.12
Haterumaimide J (hatJ) is reportedly the most cytotoxic member of the lissoclimide family of labdanediterpenoids. The unusual functional group arrangement of hatJ-C18 oxygenation and C2 chlorination-resisted our efforts at synthesis until we adopted an approach based on rarely studied terminal epoxide-based cation-π bicyclizations that is described herein. Using the C2-chlorine atom as a key stereocontrol
Synthesis facilitates an understanding of the structural basis for translation inhibition by the lissoclimides
作者:Zef A. Könst、Anne R. Szklarski、Simone Pellegrino、Sharon E. Michalak、Mélanie Meyer、Camila Zanette、Regina Cencic、Sangkil Nam、Vamsee K. Voora、David A. Horne、Jerry Pelletier、David L. Mobley、Gulnara Yusupova、Marat Yusupov、Christopher D. Vanderwal
DOI:10.1038/nchem.2800
日期:2017.11
The lissoclimides are unusual succinimide-containing labdane diterpenoids that were reported to be potent cytotoxins. Our short semisynthesis and analogue-oriented synthesis approaches provide a series of lissoclimide natural products and analogues that expand the structure–activity relationships (SARs) in this family. The semisynthesis approach yielded significant quantities of chlorolissoclimide
A fast and straightforward route towards the synthesis of the lissoclimide class of anti-tumour agents
作者:Tuan Minh Nguyen、Nguyen Quang Vu、Jean-Jacques Youte、Jacelyn Lau、Angie Cheong、Ying San Ho、Benjamin S.W. Tan、Kanagasundaram Yoganathan、Mark S. Butler、Christina L.L. Chai
DOI:10.1016/j.tet.2010.09.031
日期:2010.11
The synthesis of the chiral core structure of the lissoclimide class of anti-tumour agents containing three rings including a chiral succinimide subunit and an exocyclic double bond has been investigated The compound 7 was obtained without the use of any protecting groups for the alcohol at C-12 via an asymmetric boron-mediated aldol addition as the key step to install the chiral centres of the rare succimmido methanol moiety This was followed by a sequence of lactonisation microwave-assisted amidation and imidation reactions (C) 2010 Elsevier Ltd All rights reserved