asymmetric synthesis of (8R,9S,10R)-4,8,9-trimethyl-9-vinyl-Δ4-3-octalone, a versatile intermediate for the syntheses of both trans- and cis-neo-clerodane diterpenoids, has been achieved by extension of Ender's asymmetric alkylation, and its utility is exemplified by the total synthesis of (–)-methyl kolavenate, the first example of a clerodane diterpenoid in optically active form.
Catalytic Enantioselective Synthesis of 1,4‐Keto‐Alkenylboronate Esters and 1,4‐Dicarbonyls
作者:Michael Z. Liang、Simon J. Meek
DOI:10.1002/anie.201907757
日期:2019.10
catalytic enantioselective method for the synthesis of 1,4-keto-alkenylboronate esters by a rhodium-catalyzed conjugate addition pathway is disclosed. A variety of novel, bench-stable alkenyl gem-diboronate esters are synthesized. These easily accessible reagents react smoothly with a collection of cyclic α,β-unsaturatedketones, generating a new C-C bond and stereocenter. Products are isolated in up to
Improved enantioselective synthesis of natural striatenic acid and its methyl ester
作者:Yoann Aubin、Gérard Audran、Honoré Monti
DOI:10.1016/j.tetlet.2006.03.147
日期:2006.5
This letter describes the improved and efficient enantioselectivesynthesis of natural striatenic acid, isolated from Cheilolejeunea serpentina, and its methylester starting from a readily available enantiopure building block.
作者:Elliot P. Farney、Sean S. Feng、Felix Schäfers、Sarah E. Reisman
DOI:10.1021/jacs.7b13260
日期:2018.1.31
An 18-step synthesis of the antibiotic (+)-pleuromutilin is disclosed. The key steps of the synthesis include a highly stereoselective SmI2-mediated cyclization to establish the eight-memberedring and a stereospecific transannular [1,5]-hydrogen atom transfer to set the C10 stereocenter. This strategy was also used to prepare (+)-12-epi-pleuromutilin. The chemistry described here will enable efforts
The present disclosure provides processes for preparing (+)-pleuromutilin and synthetic (+)-pleuromutilin produced therefrom. Also provided are intermediates prepared thereby and processes for preparing these intermediates.