Direct Sulfonylation of Lithiated Alkyl Phosphonates with Benzenesulfonyl Fluoride; Facile Method for Preparation of α-Sulfonyl Alkyl Phosphonates and Vinyl Sulfones
作者:Won Bum Jang、Hyoung Joon Jeon、Dong Young Oh∗
DOI:10.1080/00397919808005967
日期:1998.4
Abstract α-Sulfonyl phosphonates were synthesized by direct sulfonylation of lithiated alkyl phosphonates with benzenesulfonyl fluoride which have shown different reactivity from benzenesulfonyl chloride, generally known as a sulfonylating reagent.
as a catalyst. This method was used to obtain a series of chiral α-sulfonyl-β-aminophosphonates in yields of up to 96% with 89:11 dr and 88% ee. These compounds were further transformed into β-aminophosphonates or chiral azetidines with various functional groups by a Horner–Wadsworth–Emmons/aza-Michael addition reaction sequence.
Intramolecular diels-alder reactions of sulphonyl-substituted trienes
作者:Donald Craig、Doris A. Fischer、Öznur Kemal、Andrew Marsh、Thomas Plessner、Alexandra M.Z. Slawin、David J. Williams
DOI:10.1016/s0040-4020(01)96038-7
日期:1991.5
The synthesis and thermal intramolecularDiels-Alderreactions of a series of sulphonyl-substituted deca-, undeca- and dodecatrienes have been carried out. The stereoselectivities of these reactions are discussed, and methylation reactions of the bicyclic products are described.
A new synthetic strategy towards the C27–C35 subunit of Eribulin (1) has been devised to include a protected 1,2-amino alcohol at C34–C35. Early introduction of the C35 amino group in the synthesis of 1 increases the efficiency of the route. This newapproach can be accomplished on a multi-gram scale and allows for the successful synthesis of Eribulin.
A Strategy for Complex Dimer Formation When Biomimicry Fails: Total Synthesis of Ten Coccinellid Alkaloids
作者:Trevor C. Sherwood、Adam H. Trotta、Scott A. Snyder
DOI:10.1021/ja5045852
日期:2014.7.9
these approaches sometimes fail, leading instead to non-natural architectures via incorrect unions. Such a situation arose during our studies of the coccinellid alkaloids, when attempts to directly dimerize Nature’s presumed monomeric precursors in a putative biomimetic sequence afforded only a non-natural analogue through improper regiocontrol. Herein, we outline a unique strategy for dimer formation