Synthetic studies on C14 cembranoids: synthesis of C4–12 fragment of sarcophytonolides E–G and L and C5–11 fragment of sarcophytonolide L
摘要:
An efficient stereoselective synthesis of C4-12 fragment of the cembranoids, sarcophytonolides E-G and L and C5-11 fragment of sarcophytonolide L is described. The C4-12 building block is efficiently assembled starting from chiral pool material (R)-carvone employing the Baeyer-Villiger oxidation, modified Knoevenagel condensation and asymmetric dihydroxylation as the key steps. The synthesis of C5-11 fragment is based on orthoester Johnson-Claisen rearrangement as the key step. (C) 2010 Elsevier Ltd. All rights reserved.
Synthetic studies on C14 cembranoids: synthesis of C4–12 fragment of sarcophytonolides E–G and L and C5–11 fragment of sarcophytonolide L
摘要:
An efficient stereoselective synthesis of C4-12 fragment of the cembranoids, sarcophytonolides E-G and L and C5-11 fragment of sarcophytonolide L is described. The C4-12 building block is efficiently assembled starting from chiral pool material (R)-carvone employing the Baeyer-Villiger oxidation, modified Knoevenagel condensation and asymmetric dihydroxylation as the key steps. The synthesis of C5-11 fragment is based on orthoester Johnson-Claisen rearrangement as the key step. (C) 2010 Elsevier Ltd. All rights reserved.
A convenient methodology for the chemoselective reduction of a wide variety of functionalized alkenes
作者:James H. Babler、Nicholas A. White
DOI:10.1016/j.tetlet.2009.11.061
日期:2010.1
An efficient method to effect chemoselective reduction of alkenes (including trisubstituted olefins) possessing various sensitive and/or reducible groups such as acetals, allylic alcohols, benzyl ethers, epoxides, esters, halides, nitriles, and sulfones is reported. The reduction is facile at 0 °C in aqueous N,N-dimethylacetamide containing sodium borohydride in the presence of 15 mol % ruthenium(III)
Selective reduction of dienes/polyenes using sodium borohydride/catalytic ruthenium(III) in various liquid amide aqueous mixtures
作者:James H. Babler、David W. Ziemke、Robert M. Hamer
DOI:10.1016/j.tetlet.2013.01.083
日期:2013.3
structurally diverse dienes and an unsymmetrical triene is reported. The reduction is facile at 0 °C in a liquid amide aqueous solution containing sodium borohydride in the presence of 15 mol % ruthenium(III) chloride. The chemoselectivity of the reaction is controlled by proper choice of the liquid amide solvent.