Temporary Phosphate Tethers: A Metathesis Strategy to Differentiated Polyol Subunits
摘要:
Studies probing reactivity and selectivity of cross metathesis (CM) with an exocyclic olefin in a P-chiral bicyclo[4.3.1]phosphate triester are described. Studies have revealed a Type III CM reactivity pattern for the exocyclic olefin within this phosphate triester. This versatile method allows for simple, selective manipulation of a P-chiral building block en route to advanced polyol subunits.
An Iterative Phosphate Tether Mediated Approach for the Synthesis of Complex Polyol Subunits
作者:Salim Javed、Arghya Ganguly、Gihan C. Dissanayake、Paul R. Hanson
DOI:10.1021/acs.orglett.1c03350
日期:2022.1.14
are iterative use of a phosphate tether-mediated one-potsequential RCM/CM/H2 with subsequent utilization of either a regio-/diasteroselective cuprate addition or a Pd-catalyzed reductive allylic transposition. This method highlights the asymmetricsynthesis of 12 complex polyol subunits in 4–6 one-potsequential operations with a total of 12–14 reactions, of which 4–5 are catalytic, with minimal workup
Modular Synthesis of Novel Macrocycles Bearing α,β-Unsaturated Chemotypes through a Series of One-Pot, Sequential Protocols
作者:Salim Javed、Mahipal Bodugam、Jessica Torres、Arghya Ganguly、Paul R. Hanson
DOI:10.1002/chem.201601004
日期:2016.5.10
A series of one‐pot, sequential protocols was developed for the synthesis of novel macrocycles bearing α,β‐unsaturated chemotypes. The method highlights a phosphate tether‐mediated approach to establish asymmetry, and consecutive one‐pot, sequential processes to access the macrocycles with minimal purification procedures. This library amenable strategy provided diverse macrocycles containing α,β‐unsaturated
An Efficient, Modular Approach for the Synthesis of (+)-Strictifolione and a Related Natural Product
作者:Susanthi Jayasinghe、Phanindra K. M. Venukadasula、Paul R. Hanson
DOI:10.1021/ol403110p
日期:2014.1.3
An efficient, library amenable, “pot economical” total synthesis of (+)-strictifolione and the related natural product, (6R)-6[(E,4R,6R)-4,6-dihydroxy-10-phenyl-1-decenyl]-5,6-dihydro-2H-2-pyrone, are reported. This modular approach takes advantage of two consecutive phosphate tether-mediated, one-pot, sequential protocols, followed by a final cross metathesis to deliver both antifungal natural products
(+)-strictifolione 和相关天然产物 (6 R )-6[( E ,4 R ,6 R )-4,6-dihydroxy-10-phenyl的高效、适合图书馆的“盆栽经济”全合成-1-癸烯基] -5,6-二氢-2- ħ -2-吡喃酮报告。这种模块化方法利用两个连续的磷酸盐系链介导的单锅顺序方案,然后进行最终的交叉复分解,在三锅过程中从各自的对映体 ( R , R )-和 (小号,小号)-三烯的纯化最少。该路线的一个显着特征是由于磷酸三酯固有的正交保护和离去基团特性,不需要额外的保护基团。
Synthesis of the C1−C16 Polyol‐Containing Macrolactone of 13‐Desmethyl Lyngbouilloside, an Unnatural Analog of the Originally Assigned Structure of (−)‐Lyngbouilloside
作者:Arghya Ganguly、Salim Javed、Mahipal Bodugam、Gihan C. Dissanayake、Rambabu Chegondi、Paul R. Hanson
DOI:10.1002/ijch.202100019
日期:2021.7
The synthesis of the C1−C16 polyol-containing macrolactone of 13-desmethyl lyngbouilloside, an unnatural analog of the originally assigned structure of (−)-lyngbouilloside is reported. Synthesis of the C1−C16 acyclic backbone is achieved via iterative use of a phosphate tether-mediated one-pot sequential, RCM/CM/chemoselective diimide reduction, with concomitant use of a regio- and diastereoselective
Total Synthesis of Dolabelide C: A Phosphate-Mediated Approach
作者:Paul R. Hanson、Rambabu Chegondi、John Nguyen、Christopher D. Thomas、Joshua D. Waetzig、Alan Whitehead
DOI:10.1021/jo2003506
日期:2011.6.3
The first synthesis of dolabelide C (1), a cytotoxic marine macrolide, is reported utilizing a phosphate tether-mediated approach. Bicyclic phosphates (S,S,S-p)-5 and (R,R,R-p)-5 serve as the central building blocks for the construction of two major 1,3-anti-diol subunits in 1 through selective cleavage pathways, regioselective olefin reduction, and cross-metathesis. Overall, phosphate-mediated processes provided copious amounts of both major subunits allowing for a detailed RCM macrocyclization study to the 24-membered macrolactone 1.