Lycopodium Alkaloids: Isolation and Asymmetric Synthesis

2011 ◽  
pp. 1-31 ◽  
Author(s):  
Mariko Kitajima ◽  
Hiromitsu Takayama
Keyword(s):  
Asymmetric Synthesis ◽  
Lycopodium Alkaloids

ChemInform Abstract: IMDA/Retro-Mannich Approach to cis-Perhydroquinoline Lycopodium Alkaloids: Asymmetric Synthesis of (+)-Luciduline (X).

ChemInform ◽  
2010 ◽  
Vol 30 (42) ◽  
pp. no-no
Author(s):  
Daniel L. Comins ◽  
Clinton A. Brooks ◽  
Rima S. Al-awar ◽  
R. Richard Goehring
Keyword(s):  
Asymmetric Synthesis ◽  
Lycopodium Alkaloids

General Cyclopropane Assembly via Enantioselective Redox-Active Carbene Transfer to Aliphatic Olefins

2018 ◽  
Author(s):  
Marc Montesinos-Magraner ◽  
Matteo Costantini ◽  
Rodrigo Ramirez-Contreras ◽  
Michael E. Muratore ◽  
Magnus J. Johansson ◽  
...  
Keyword(s):  
Total Synthesis ◽  
Asymmetric Synthesis ◽  
Chemical Space ◽  
Synthetic Approach ◽  
Asymmetric Cyclopropanation ◽  
Redox Active ◽  
Wide Range ◽  
Leaving Group ◽  
Stereoelectronic Properties ◽  
Carbene Transfer

Asymmetric cyclopropane synthesis currently requires bespoke strategies, methods, substrates and reagents, even when targeting similar compounds. This limits the speed and chemical space available for discovery campaigns. Here we introduce a practical and versatile diazocompound, and we demonstrate its performance in the first unified asymmetric synthesis of functionalized cyclopropanes. We found that the redox-active leaving group in this reagent enhances the reactivity and selectivity of geminal carbene transfer. This effect enabled the asymmetric cyclopropanation of a wide range of olefins including unactivated aliphatic alkenes, enabling the 3-step total synthesis of (–)-dictyopterene A. This unified synthetic approach delivers high enantioselectivities that are independent of the stereoelectronic properties of the functional groups transferred. Our results demonstrate that orthogonally-differentiated diazocompounds are viable and advantageous equivalents of single-carbon chirons<i>.</i>

Sign in / Sign up

Export Citation Format

Share Document