Hot water-promoted cyclopropylcarbinyl rearrangement facilitates construction of homoallylic alcohols
作者:Pei-Fang Li、Cheng-Bo Yi、Jin Qu
DOI:10.1039/c5ob00305a
日期:——
H2O–1,4-dioxane and without an additional catalyst, the rearrangements of various types of cyclopropylcarbinols were attempted. It was found that the reactions generally gave homoallylic alcohols in good to very high chemical yields. Rearrangements of bicyclic or tricyclic cyclopropylcarbinols readily gave the desired ring-expanded cyclic homoallylic alcohols which are difficult to synthesize by other
ASYMMETRIC REDUCTION OF PROCHIRAL CYCLIC KETONES WITH LITHIUM ALUMINUM HYDRIDE PARTIALLY DECOMPOSED BY (1R,2S)-(−)-<i>N</i>-METHYLEPHEDRINE AND 2-ALKYLAMINOPYRIDINE
The title chiral hydride was found to reduce prochiral cyclicketones, affording the corresponding optically active cyclic alcohols in high optical(max. 9 8%ee) yields.
发现标题手性氢化物可还原前手性环酮,以高光学(最大 9 8%ee)产率提供相应的旋光环醇。
Enantioselective Microbial Oxidation of Allyl Alcohols
A new route to the optically active allyl alcohols by microbial oxidation is disclosed. Yamadazyma farinosa IFO 10896, a yeast, efficiently catalyzes the enantioselective oxidation of allyl alcohols to afford the corresponding optically active alcohols as the remaining substrates. This reaction is applicable to both cyclic and acyclic compounds.
Enantiocontrolled total synthesis of (+)-bakkenolide-A
作者:Andrew E. Greene、Fernando Coelho、Jean-Pierre Deprés、Timothy J. Brocksom
DOI:10.1016/s0040-4039(00)80838-2
日期:1988.1
An efficient, stereoselective totalsynthesis of natural bakkenolide-A has been effected from (S)-1,6-dimethyl-1-cyclohexene, which can be obtained from 2-methyl-2-cyclohexen-1-one in 3 high-yield steps.
Stereo- and regioselectivity in the P450-catalyzed oxidative tandem difunctionalization of 1-methylcyclohexene
作者:Gheorghe-Doru Roiban、Rubén Agudo、Manfred T. Reetz
DOI:10.1016/j.tet.2013.04.132
日期:2013.7
non-functionalized molecules using biocatalysis based on P450 monooxygenases is known to be difficult due to the expected poor regio- and stereoselectivity, but in this study it was nevertheless attempted. 1-Methylcyclohexene was subjected to oxygen-mediated biocatalytic oxidation using P450-BM3 as the catalyst. Both oxidative hydroxylation and epoxidation were observed, in some cases leading to hydroxy epoxides with