三丁基膦与酚类的温和协同催化剂(例如(±)-1,1'-联-2-萘酚(BINOL)在THF中)促进了Baylis-Hillman反应,从而以高收率得到α-亚甲基-β-羟基链烷酮。在有1,1'-联-2-萘酚存在下,该反应进行得比在没有它的情况下进行得快得多。的1项1 H NMR研究表明,1,1'-联-2-萘酚用作布朗斯台德酸来激活醛和偏振烯烃的羰基。通过使用三丁基膦与钙手性催化剂的协同催化剂来检查反应在催化不对称合成中的应用,以相当好的收率得到具有相当好的%ee的所需产物。
Chiral 2-(2-hydroxyaryl)alcohols (HAROLs) with a 1,4-diol scaffold as a new family of ligands and organocatalysts
作者:Ömer Dilek、Mustafa A. Tezeren、Tahir Tilki、Erkan Ertürk
DOI:10.1016/j.tet.2017.11.054
日期:2018.1
Efficient and modular syntheses of chiral 2-(2-hydroxyaryl)alcohols (HAROLs), novel 1,4-diols carrying one phenolic and one alcohol hydroxyl group, have been developed which led to generation of a small library of structurally diverse HAROLs in enantiomerically pure form. Of the different HAROLs examined, a HAROL based on the indan backbone exhibited the highest activity and enantioselectivity in the
高效和模块化的手性2-(2-羟基芳基)醇(HAROLs)的合成,带有一个酚和一个醇羟基的新型1,4-二醇已被开发出来,这导致在对映异构体中生成结构多样的HAROLS小文库纯形式。在考察的不同HAROL中,基于茚满骨架的HAROL在Ti(O i Pr)4(y高达97%, 88%ee)并在三田膦的促进下在Morita-Baylis-Hillman反应中作为氢键供体有机催化剂发挥作用。
The chalcogeno-Baylis-Hillman reaction: a new preparation of allylic alcohols from aldehydes and electron-deficient alkenes
The chalcogeno-Baylis-Hillman reaction catalyzed by sulfides and selenides, the group 16 element compounds, in the presence of Lewis acids was developed. The reactions proceeded smoothly by the use of 1 equiv of TiCl4 to give the coupling products in moderate to good yields. Bis-chalcogenides and related compounds were investigated as a catalyst, and 1,5-diselenocyclooctane gave the best result owing
Stereocontrolled syntheses of hydroxylated tricyclic systems by a new annulation of 2-cyclohexen-1-one
作者:Charles M. Marson、David W.M. Benzies、Adrian D. Hobson
DOI:10.1016/s0040-4020(01)80982-0
日期:1991.7
Tricyclic keto-diols have been synthesised by a three-step annulation procedure in which hydroxyenones, prepared by the coupling of 2-cyclohexen-1-one with aldehydes, are diastereoselectively epoxidised and the syn-epoxides cyclised with tin(IV) chloride. Kinetic resolution of the hydroxyenones was achieved by enantiomeric epoxidation.
Convergent, stereocontrolled routes to hydroxylated tricyclic systems: a new annulation of 2-cyclohexen-1-one
作者:Charles M. Marson、David W. M. Benzies、Adrian D. Hobson、Harry Adams、Neil A. Bailey
DOI:10.1039/c39900001516
日期:——
Tricyclic keto diols have been synthesised by a new, three-step annulation procedure in which hydroxyenones, prepared by the coupling of 2-cyclohexen-1-one with aldehydes, are diastereoselectively epoxidised and the syn-epoxides cyclised with tin(IV) chloride.
Asymmetric Morita−Baylis−Hillman Reactions Catalyzed by Chiral Brønsted Acids
作者:Nolan T. McDougal、Scott E. Schaus
DOI:10.1021/ja037705w
日期:2003.10.1
Chiral BINOL-derived Brønstedacidscatalyze the enantioselective asymmetric Morita-Baylis-Hillman (MBH) reaction of cyclohexenone with aldehydes. The asymmetric MBH reaction requires 2-20 mol % of the chiral Brønstedacid 2e or 2f and triethylphosphine as the nucleophilic promoter. The reaction products are obtained in good yields (39-88%) and high enantioselectivities (67-96% ee). The Brønsted-acid-catalyzed