diastereoselectivities. With disubstituted homoallylsilanes, tetrahydrofurans having acyclic chiral centres were also obtained. An application of this methodology to an approach towards the totalsynthesis of (+/−)-kumausyne is proposed on the basis of these preliminary results. The four chiral centres of this marine natural product have been set up with excellent diastereoselectivities.
Synthesis of 1-Acyl-2-alkylcyclopropanecarboxylic Esters from 2-Alkenylphosphonium Salts
作者:D. Jacoby、J. P. Célérier、H. Petit、G. Lhommet
DOI:10.1055/s-1990-26858
日期:——
The one-pot reaction of allyltriphenylphosphonium bromide with the sodium salts of ß-keto esters leads to the formation of alkyl 1-acyl-2-alkylcyclopropanecarboxylates.
醇基三苯基膦溴化物与β-酮酯的钠盐进行一锅反应,生成烷基1-酰基-2-烷基环丙烷羧酸酯。
Regioselective Hydroformylation of Allylic Alcohols
作者:Thomas E. Lightburn、Omar A. De Paolis、Ka H. Cheng、Kian L. Tan
DOI:10.1021/ol200782d
日期:2011.5.20
hydroformylation of allylicalcohols is reported toward the synthesis of β-hydroxy-acid and aldehyde products. The selectivity is achieved through the use of a ligand that reversibly binds to alcohols in situ, allowing for a directed hydroformylation to occur. The application to trisubstituted olefins was also demonstrated, which yields a single diastereomer product consistent with a stereospecific addition of CO
据报道,烯丙醇的高度区域选择性加氢甲酰化可用于合成 β-羟基酸和醛产物。选择性是通过使用一种配体来实现的,该配体在原位可逆地结合醇,允许发生定向加氢甲酰化。还证明了三取代烯烃的应用,这产生了与 CO 和氢的立体有择加成一致的单一非对映异构体产品。
An expeditious approach to the synthesis of chiral butadienyl alcohols
作者:J.S. Yadva、D Srinivas、T Shekharam
DOI:10.1016/s0040-4039(00)73257-6
日期:1994.5
A highly regioselective reduction of epoxy allylic alcohols to chiral butadienyl alcohols and its application to taxol skeleton is described.
描述了将环氧烯丙基醇高度区域选择性还原为手性丁二烯基醇及其在紫杉醇骨架中的应用。
Regioselective Hydroformylation of Sulfonamides using a Scaffolding Ligand
作者:Amanda D. Worthy、Moriah M. Gagnon、Michael T. Dombrowski、Kian L. Tan
DOI:10.1021/ol900921e
日期:2009.7.2
A highly regioselective hydroformylation of allylic sulfonamides has been developed by employing a catalyticdirectinggroup. The reaction tolerates a wide range of electronically and sterically modified olefins, and only 10% of the scaffolding ligand is required to effectively control the regioselectivity.