Novel synthetic routes suitable for constructing benzopyrone combinatorial libraries
摘要:
A series of O-(t-butylsilyloxy)benzoyl chlorides generated from the corresponding silyl esters were coupled with a range of terminal alkynes to afford the corresponding alkynyl ketones. The alkynyl ketones were converted to enaminoketones and then cyclized to yield the desired benzopyrone ring system. This synthetic protocol utilizes readily available starting materials, mild and high yielding reactions with good functional group tolerance, and is ideal for developing combinatorial libraries centered around the benzopyrone ring system. (C) 1999 Elsevier Science Ltd. All rights reserved.
Convergent stereospecific synthesis of C292 (or LL-Z1640-2), and hypothemycin. Part 1
作者:Patrice Sellès、Robert Lett
DOI:10.1016/s0040-4039(02)00870-5
日期:2002.5
The stereospecific synthesis of the precursors required for the 14-membered ring formation either via an intramolecular Suzuki coupling or via an intermolecular Suzuki coupling followed by a macrolactonisation is herein reported. One-pot Suzuki couplings were here achieved with vinyldisiamylboranes which were generated in situ from the related chiral precursor. The present convergent approach of C292 (or LL-21640-2) and hypothemycin gives a flexible access to related macrolides. (C) 2002 Elsevier Science Ltd. All rights reserved.
An Enantioselective Total Synthesis of (+)-Aigialospirol
作者:Ruth Figueroa、Richard P. Hsung、Christle C. Guevarra
DOI:10.1021/ol702195w
日期:2007.11.1
A concise and enantioselective total synthesis of (+)-aigialospirol is described here, featuring the first complex natural product synthesis that employs a cyclic ketal-tethered ring-closing metathesis strategy and an unexpected stereoselective epimerization of a benzylic hydroxyl group. The 15-step synthetic sequence illustrates the proof-of-concept that such an approach can be competitive with the classical spiroketal formation in the natural product synthesis.