Application of the lithiation–borylation reaction to the rapid and enantioselective synthesis of the bisabolane family of sesquiterpenes
作者:Varinder K. Aggarwal、Liam T. Ball、Simon Carobene、Rickki L. Connelly、Matthew J. Hesse、Benjamin M. Partridge、Philippe Roth、Stephen P. Thomas、Matthew P. Webster
DOI:10.1039/c2cc32176a
日期:——
The expedient enantioselective synthesis of 5 bisabolane sesquiterpenes has been achieved using a common, one-pot lithiation-borylation reaction of secondary benzylic carbamates and either protodeboronation or oxidation to give the natural products in fewer than 5 steps, with high yield and >94 : 6 er.
Stereocontrolled Synthesis of Adjacent Acyclic Quaternary-Tertiary Motifs: Application to a Concise Total Synthesis of (−)-Filiformin
作者:Daniel J. Blair、Catherine J. Fletcher、Katherine M. P. Wheelhouse、Varinder K. Aggarwal
DOI:10.1002/anie.201400944
日期:2014.5.26
developed for the synthesis of acyclic quaternary‐tertiary motifs with full control of relative and absolute stereochemistry, thus leading to all four possible isomers of a stereodiad. A novel intramolecular Zweifel‐type olefination enabled acyclic stereocontrol to be transformed into cyclic stereocontrol. These key steps have been applied to the shortest enantioselective synthesis of (−)‐filiformin
The total synthesis of (−)-aplysin via a lithiation–borylation–propenylation sequence
作者:Catherine J. Fletcher、Daniel J. Blair、Katherine M.P. Wheelhouse、Varinder K. Aggarwal
DOI:10.1016/j.tet.2012.05.095
日期:2012.9
A concise, highly enantioselectivesynthesis of sesquiterpene natural products (−)-debromoaplysin and (−)-aplysin has been completed. The key steps included lithiation–borylation of a secondary benzylic carbamate to give a tertiaryboronicester followed by propenylation which installed the quaternary stereocenter with complete enantioselectivity. Subsequent RCM followed by deprotection and in situ